My main concern is in the viewfinder--how do they compare? In terms of brightness/clarity and rangefinder patch contrast. I know that they are 1:1 so size is not an issue (and I do not wear glasses). My main concern is dealing with near invisible patches. It seems that most P's are faded, is this not true with Nikon? Nikon's seem to be more desireable than Canon's but I'm trying to figure out if it is just because it is Nikon or if the cameras are actually "better". It seems that some people prefer the Nikon RF's over the Leica M's but not many prefer Canon RF's over Leica M's.