You aren't going to find a whole lot for "specifics" on any of these four for 2016. All of them have been in production for several years unchanged for the model years you list. The CBR since 2013, the current GSX-R models (aside from the 1000) have been around, unchanged, since 2011. The R6 for 2017 has new bodywork, but the 2016 model was last retouched in 2010.
Go with whichever one "fits" you best. Nobody can tell you which ones will do this. Generally speaking, the Honda and GSX-R will be a tiny bit more relaxed, and the R6 is very aggressive.
All four are well-built bikes that will last you a long time. I've actually found small I-4s on the street to be pretty tractable and easy to live with. I've never understood the aversion. If you're trolling around town at 3500rpm on a 600, you're doing it wrong - ride it as it's designed, and you won't have any issues... though, you probably know this having had a 750 already. As far as fours vs. twins on the street, I had a ZX-6R (2011), and also had an Aprilia Falco (1000cc twin) - the 6R was a FAR better street bike - sport twins tend to be pretty snatchy at low rpm, and don't really run smoothly until almost 4000rpm anyway... and this was a bike that was "tuned" for street use. The 6R could walk it from pretty much any speed.
My choice, personally, would be one of the GSX-Rs. If I want an I-4 sportbike, I want some meat on the top of the powerband. That counts out the Honda, which falls on its face up top. The R6 is great (club racers still buy shitloads of these things), but the seating position turns me off. $11k and $10k are a bit steep for the GSX-Rs around here... a dealer on the other side of the cities from me is selling the 750s and 600s for $10k and $9k, respectively. You might have a bit more wiggle room for negotiation.
And if you can find a 2016 for significantly less, go with that - again, they're *exactly* the same bike.