I guess different people react to different things, well, differently! (Hardly an amazing insight, I know.) I took to RF focus on the Hexar RF instantly, despite having never so much as looked through the viewfinder of an RF camera beforehand, and was getting good focus from the first frame. I've never had a problem, even shooting my 75/1.4 wide open. While things are probably easier with my M3, for 50mm or longer lenses, I find the .6x magnification of the Hexar RF easy enough to work with - and I like the ability to view wider framelines and having lots of room around the framelines for all but 28mm. (I wouldn't want to use it for a 135, though.)
...Mike