I have carpal tunnel syndrome in both hands and certain shapes just don't work for me - hence disposal of the D700 and why I'm less fond of the R7 - it needs gripping more as it's thin. Whereas the SL2 and the R8 seem to fit perfectly and are not a trial. It's also among the reasons I love the M5.
All are a bit heavy though around the neck. Time to redeploy my Optech Hasselblad strap!
Leica M2, Nikon D700, Bronica RF645, Leica CL, Summicron 40mm, Rolleicord Va, Hasselblad 500 CM Zeiss Planar, Leica 50mm Summicron V3, Hasselblad PME51 metered prism, Zeiss Ikon Super Ikonta 534/16 & Ensign 820 Special - all gone.