Picked up Diva f while I was in Japan not too long ago. I also played the demo version of Diva F while I was in Sapporo for the Vocaloid concert and Snow Festival.
The lack of online leaderboards for Diva f is disappointing; maybe I should have done some research before purchasing (or did I hopefully miss it somehow?)...I've managed to clear all the songs on Hard with a Great or better rating, but it's going to be a while before I clear all of the songs on Extreme with anything...
And in case anyone cares, I took a bunch of photos of Vocaloid stuff while I was in Sapporo.
http://min.us/mMarp2YOdXYXM
I went to Vocalobit in Shizuoka as well, but there wasn't much to see there.
From what I can tell, it's 30fps 1080p everywhere. The author editorializes that he would prefer the game be downgraded to 720p if it meant a framerate increase.
I thought it looked/felt a bit smoother than the Vita version. I played the Diva F demo twice and watched a bunch of people play it. I was switching my attention between the demo screens and Diva f (getting some practice in while waiting in line), and the framerate seemed different somehow. It's too bad they didn't have a Project Diva arcade cab set up right next to the demo area for easier comparison, heh. Maybe it's something weird like 45fps with triple-buffering enabled, or my mind is just playing tricks on me.