I have the Studio and had the F30 at the same time. I prefer the Studio over the F30 - better imaging and tighter and faster bass. The F30's bass was slightly boomy compared to the Studio. I have not seen the F50 yet.
I also have revel M20 and B15 sub. I think the M20 with a Revel B15 sounds better the F30.
I also have revel M20 and B15 sub. I think the M20 with a Revel B15 sounds better the F30.