Like has been mentioned before, top tube length is way more important. I've got a bike with a compact frame and 53.5ish cm TT as well as the Bianchi that has more like a 55 or 56 cm TT. Both fit me very well. The standover on the two is reallly different. Standover has essentially no sway over bike fit (to a point, obviously) because there are so many different designs.

I do have to angle the larger bike over a little to mount it, but whatever, it screams.