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Can't comment on force, but 6800 for me was a massive step up from 6600 (I never rode 6700). Once you get a feel for how the lever interacts with the derailleur it's rather smooth shifting, and fairly accurate. Braking was a huge step up, I was actually surprised. Brakes also have spring tension adjustment...6600 didn't. Can't comment on the pads, I immediately switched them out to koolstop blacks. FD takes some learning to set up correctly, but isn't challenging. I still use a chain watcher out of habit, but haven't heard it impact the watcher yet, even under abusive shifting to cross chaining. Just make sure you get really good inline cable adjusters!
The best way is to get out there and test both, be that through a LBS or nicking a mates bike for the day.
On that note, does anyone know of a cable adjuster that doesn't slip out of position (tension wise) or some sort of solution to it slowly undoing itself? I use jagwire aluminium adjusters at the moment.
Been reading this thread a lot recently. But still can't find a right answer, what are people's opinion between Ultegra 6800 and force 22? It's only for one of my Sunday best bikes.