I can't speak to the relative merits of RF lenses being sharper than SLR lenses -- because I've never done a verifiable test -- I CAN tell you that as I've aged to my present 60 years of age I find RF cameras, be they Leicas, Canons, Nikons, Zeiss Contax or Yashica, to be much easier to focus in marginal light and/or in situations where there are no obvious lines to facilitate use of the split image on the SLR focusing screen. And, obviously, my whole mental grasp of the image is very different between an SLR screen and the RF direct view. I've got lots of SLRs, but I find I am increasingly using RF cameras.