I'm always intrigued when new cameras come out, but I haven't hit the preorder button as of yet on either of these new models. I do like my R5, but I have a few quibbles with it:
- Frame rate drops with battery charge under about 50% in mechanical shutter mode
- Slow start-up time when turning it on (or bringing it back to life after it goes to sleep)
- Could use better weather sealing (viewfinder will fog up if camera gets wet)
- Animal eye-detect works for birds and cats and dogs but not much else
- Single-point autofocus square is rather large in the frame. Smaller focus point would be nice, to get it exactly where I want it.

I'd be keen to hear if any of these issues have been improved upon with the new R5. Or maybe all of these are reasons I should get a R1 ?

Also regarding file size --- I've been using C-RAW for quite a while and I like it a lot. Smaller file size means more images on the card, and best of all a larger effective buffer size so I can hold down the button for longer when the action gets going.