I'm seriously contemplating buying an M240 and lenses between 28 and 135. While researching my options, I discovered the R 28-90 which looks as if it would cover most of my requirements. Having watched a friend using an R lense on his M with the adapter, I'm wondering why I shouldn't go the same way and buy a 28-90. The price is eye-popping for a used lense but that seems to be the way of R lenses today.
Are there any gotchas? I know that I will need to focus with the EVF but for a landscape guy, I can't see any other problems.