Taller seat height. You forgot the ZX6R...which is the only other bike I've ridden extensively.
R6 vs. ZX6R...
R6 feels "wider", the windscreen is at a much better angle, has side exhaust which is much nicer (undertail exhaust can create a "whirlpool" effect, making the rider's back dirty). R6 pumps out more horsepower according to Sport Rider and Cycle World Magizines. To me, the R6 "leans" better.
The ZX6R has a gear indicator and sounds better w/o Yamaha tick.
R6 vs. ZX6R...
R6 feels "wider", the windscreen is at a much better angle, has side exhaust which is much nicer (undertail exhaust can create a "whirlpool" effect, making the rider's back dirty). R6 pumps out more horsepower according to Sport Rider and Cycle World Magizines. To me, the R6 "leans" better.
The ZX6R has a gear indicator and sounds better w/o Yamaha tick.