AJShepherd
Well-known
I'm quite fond of my ETRS, although I've beefed mine up a bit with the AEII prism and the speed grip, so I call it the BMFSLR (Big, err, 'Mirror Flipping' Single Lens Reflex!).

Empty Deckchairs by Antony J Shepherd, on Flickr
Also, I do like the ability to switch film magazines, so I can load one magazine with colour film, and another with black and white film, then switch between them if I think a shot would look better with one than the other. Which you can't do in a 645 RF...
(Mind you, I wish I'd got a 645RF while I had the chance...)

Empty Deckchairs by Antony J Shepherd, on Flickr
Also, I do like the ability to switch film magazines, so I can load one magazine with colour film, and another with black and white film, then switch between them if I think a shot would look better with one than the other. Which you can't do in a 645 RF...
(Mind you, I wish I'd got a 645RF while I had the chance...)