Beloved 1D Mark III to Sony A7RII

mcluckie wrote in post #18194199
I don't think any mirrorless camera will totally replace a DSLR. I used to keep a Leica M system and an SLR like Nikon, or eventually for me, the Leica R system. I was never a huge 35mm fan (but somehow got 5 bodies and eventually 15 lenses for the jobs that needed that format), and I don't see that digital has changed these primary uses very much. I'd suggest keeping both systems for a while and gradually making the move complete if you so desire. Personally, I would just plan on keeping both systems. Maybe you don't need complete lens overlaps if you can figure out what purpose you would have for each camera. I think the Sony would be very nice for street photography with lenses in the 24 to 50 mm range, and a full frame DSL for all the other commercial gigs, landscape, etc. (being whatever you purchased the 1D for).

Going from a 1D series to a Sony is a huge jump. I think the obvious move would be to the 5D series; if you had a 5D series and wanted things smaller/lighter, then yes, the Sony makes sense. Unless you no longer need the focusing speed, build quality, weather-sealing, battery life, and all the other reasons you bought the 1D for, then get whatever excites you.

Using adapters on EF lenses is expensive and bulky. I would plan on selling your Canon lenses and just buying the native Sony glass.

Just buy both, keep both for a while until you have some real-life, first-hand experience.