I had the opportunity to test a pair of F112s vs a pair of F110s. Same location, same system. The F112s produce more powerful (visceral) bass and seem less stressed (less movement) than the F110s. I would not consider it a night-and-day upgrade in a pure two-channel system IN MY ROOM. Other settings and other uses may prove very different.
The reasons to start with the F112 are aesthetics (a 12" looks the part), potential when stressed and having the more commonly reviewed model (which probably helps long-term resale). These three reasons probably do not merit the price difference, but I'm keeping them to avoid the worse of the audiophile vices: buyer's remorse.