The 675 is quite a narrow bike. It has so much midrange for a middleweight bike that would make it very useable on the roads. On track and in the twisties, it's a weapon. Don't let its modest size belie what is quite a capable bike. I've attached pics of me at Donington park at the same corner as a comparison between my R1 and my mate's 675.
I'm 5'9 and had plenty of room to move around on the bike. It reminded me of my old ZXR250C (No, not the Ninja 250, the IL4 screamer), which was a good thing. Agility vs stability. What do you want? I found the front end of the 675 very confidence inspiring and the riding position and ergonomics just coax you into riding progressively, letting you safely find your limits. Despite not having a slipper clutch, ABS or traction control, it's quite a raw, undilluted riding experience.
I just find the gixxer a bit "meh". The Trumpet on the other hand has character. Even with stock exhaust, you will giggle every time you hear the induction howl through the airbox. BTW, just because a bike has brembos doesn't mean that other brakes are poorer. Weight and more importantly its distribution/bias will have an equally important effect. Couldn't fault the Daytona, road or track. Stick on some nice rubber like Dunlop Sportsmarts or Bridgestone S20 Evos and you will struggle to find a finer handling apex hunter.
Unsurprisingly, my lap times were slighlty quicker on the 675 than the R1 at Donny.