I have never ridden a smaller bike (well not in 40 years anyway) but I have a friend who owns 6 liter bikes including the latest zx-10 and an older one + he crashed the gen he had before that. He just bought a 2015 CBR and also owns a Ducati and a 600. His ZX-14 is the fastest according to him. I'm sure it is the low down torque that makes it feel that way. In a roll on where the liter bike is spinning fast, I think they would beat our busa. That's the kind of race you're most likely to engage in on the street. On the other hand, if you're serious about going fast, a boosted busa is what I would want to be on even over a boosted liter bike. A liter bike is for road racing. I wouldn't even want to turbo it. The busa is just asking for a turbo and it's not bad for playing road racer on the street either.
You are right though, it is about time the busa stepped up its game. This is getting ridiculous. I'll probably keep my Gen2 though. The longer you own these bikes, the more you realize what comes from the factory is not the main factor in performance. You buy what you like and build it into anything. You keep way ahead of the factory that way. I'm sure there are plenty of Gen1 busas out there that will kill any literbike and they will probably have no reason to buy a Gen3 if all it is is another 15-20 hp and some electronics.