Yes--I made the switch from my Canon DSLRs (5DM3/5Ds) to the Canon R5.  Was a bit hesitant to make the move at first---wasn't sure if Mirrorless was a gimmick and even worthy of consideration.  After all, I've been a very happy Canon DSLR shooter for my entire life (starting with film camera in 1981).  So, making the move took a lot of thought.  Was thinking about buying the 5DM4, but then looked at the R5.  But I could never be more happy--my R5 is simply the best camera I've ever had the pleasure of holding in my hands.  It's the best camera ever created; perfect stills camera (I don't shoot video at all).  No one will ever get me to say one bad thing about it.  R3--they can keep it; 24 mpxls isn't what I'm looking for in my main camera body.   And Eye AF isn't something that interests me.  Maybe one day when the technology is perfected.  Right now it appears as if the camera needs to be calibrated before every shoot.   R1---nope.  It'll likely have a few more mpxls, but the resolution in the R5 is already perfect.   Cheers from a very happy Canon guy and R5 fanatic!

I switched from a Canon 5D mark II back in 2013 to a Sony A7, the original A7. Havent looked back since I made the jump. Since then Ive owned many mirrorless cameras, Fujifilm XE-1, XT-1, XT2, XH-1 and a bunch of Fuji X100 variants, all the way up to the X100F. I loved my Canons and Ive shot with a variety of them, starting with the old t70 from the FD era, 10D up to the 7D and then fullframe, the 5D Mark II was a gamechanger and a beautiful camera. Being mostly a legacy lens shooter I needed to keep an eye out for what lenses could be mounted to my Canon 5D without hitting the mirror, i even did a mirror shave mod to fit some old FD and Contax glass. These days I shoot with a Panasonic S1, one of the best built and advanced camera I have owned and it's awesome with MF lenses. I still shoot manual lenses but nowadays it's autofocus most of the time, feels like cheating. Anyway, mirroreless cameras are the future and they are very capable with outstanding glass from the big names and you can adapt legacy lenses with ease. I'm very happy with my lumix S1, I can get lenses from Sigma, Leica and Panasonic for it and so so many beautiful manual lenses!

Regards

Omar

I wouldn't, as an occasional wedding photographer I need my 1500-2000 shots per battery and I don't want to miss an optical viewfinder. It can't be faster, with less delay, no display or electronic viewfinder can give me the same level of detail. Lastly, I want to see the real world and imagine the outcome independant from what I see. A pixel processor in between is an obstacle in doing so. But yes, many photographers appreciate the MPs, the smaller size, less weight, new(er) technology. Probably I'm old-school, but I am a viewfinder-type of photographer...

I love my Canons, (Mark II and III) but I've also noticed how heavy my 70-200 lens has become! So now, I've added a FujiFilm Tx-4: It has lightning-quick response time and quiet shutter-button, (a bonus when out with wildlife). I prefer to compose what I'm seeing through a viewfinder though, because it reduces distractions around me. I feel like both types of cameras meet my needs. 

I have switched from D750 to Z7. I think there are pros and cons. I can now use almost all dslr lens after the switch, also a few z line lens. If you want to save weight, you may save a few hundred grams if you do landscape ultraawide, but not that much if you use Tele. In terms of image quality, it will be a gain after the shortened flange length. However, due to no mirror and larger mount diameter, my Z7 is so much easier to gather dust. In addition, you will find a bit slower in terms of AF speed. Hope this help.

Hi Vincent,

As a nikonian I still keeping my loved cameras D750 and D850. No way to sell them. May be if you are thinking about mirrorless to add , look at the Sony Alfa 7R IV . Absolutely amaizing. A perfect competitor to my nikons but as a supplement of my photographic equipment. 

For help may be you can check > https://www.dxomark.com/Cameras/Nikon/D850

B,. rgds from Spain

Albert

Its a world of difference when you switch to electronic viewfinders.. i used canon dslr then switched to sony a7r3 and i couldn't adjust to evfs at all. Also the physical feel of holding a dslr is totally amazing as against toyish feel of mirrorless cams. 
the focussing systems always matter more on cross type points so it doesnt really matter in reality the huge number of focus points in mirroless systems... 

Battery life will always be better in dslrr and lastly the consistency of performance in wildlife and sports will always be with dslr . 
Also if uve decided to make switch, then nikon z7 and z9 would not disappoint u as u can keep the lenses and use ftz adapters... 

Many valid points, most i can agree with but if you ever held a Fujifilm XH-1 or a Panasonic S1 you can't really call them toy cameras. They are solid cameras, especially the S1. It's big and heavy with excellent ergonomics and quality. The evf of the newer gen mirrorless cameras are outstanding. My S1 has a superb evf, the best I've tried and seen. I understand if you can't get adjusted to evf or prefer optical viefinders, i used to be the same. The other points about AF performance and battery I can only say, battery is better on DSLRs and i used to only shoot manual lenses, so any judgement on the performance of mirrorless vs DSLRs regarding AF,  is not mine to make. 

Regards 

Omar 

I changed from a Nikon D750 to a Z7, great increase in image quality in my view, also  due to focus peaking, I have not the best eyes, but this helps so much.

Dust is a big problem, since the Nikon sensor is not protected when you change the lens. Moreover, the new lenses are really better than the comparable older ones, eg the telelens 70-200 /f/2.8, Nikkor 1o5 mm macro, 24-70mm f2. I love the electronic viewfinder a lot,  it helps me in judging images enormously.

Would not change back, I still own the D750 but almost never use it.

I switched from my D850 over to the Fujufilm GFX100s mirrorless.  Wow, what a step up in performance to the medium format world with now full frame sharpness I've never exerienced with my Nikon even with multiple focus staking. The con is the file sizes get large and you computer will need to handle it, but I don't have to take double shots as with my Nikon for stiching or higher resolutions. The other con is people are jumping out of Nikon making the market flood with lens, so their resale prices have dropped.

I switched to the Nikon Z9 and I think that the focusing with this camera is superior to any other camera I ever had. I do people photography and I can now easily switch angles, keep the camera at lower and higher points and still be sure that the camera focuses on the eye. I also like it that you immediately notice through the view finder if your exposure is right. And compared to the Z7 the Z9 has improved in battery life. You can charge it with a usb-c cable without taking the battery out. I am happy I made the switch from the Nikon D850.

Go for mirrorless I recomend from Z7 and up but price and has it all Z8 is good deal! With an FTZ adapter you can use your Nikkor F lenses works fine but Z lenses are lighter and more performance.

All cameras has dust problem because the zooming which cause a vacuum inside the lens, just have to learn how to keep it clean! https://m.media-amazon.com/images/I/512CfyJARbL._AC_SX679_.jpg

As a colleague mentioned before me, I switched from Nikon to Fuji GFX100s. However, the Nikon Z8 or Nikon Z9 may be the choice for you. It depends on what you are photographing. I can say that Z lenses are great (I have experience with e.g. Nikon Z 50 1.2, Nikon Z 70-200...). They are sharp, focusing is fast.

I still switched to Fuji because of a sale (broken body), because of the size of the chip, and I have to say that the controls and functions are exactly what I need (I shoot mostly landscapes and portraits).