I considered all three options, and I test rode them all before making my decision. I didn't enjoy riding the X as much as the other two, it seemed too tall for me (and I'm 189cm/6'2" tall) and had buffeting from the screen, plus I wasn't a huge fan of the styling.
I really enjoyed both the R and the F. I didn't find the R uncomfortable at all, but the F is probably even more comfortable with its more upright position. In the end it was styling that made me go for the F - it's not that I didn't like the R, but it looked too similar to the CBR125/250s for my liking, while also having a bit of "wannabe 600" feel to it. Whereas the F has its own unique style, doesn't pretend to be something else, and looks great outright. That's just my opinion of course. Also I needed a topbox, and thought that it would look cr*p on the R.
Very happy with my decision.