Agree to all statement above.
Both are very powerful bike and must be treated with respect.
Ridding a ZX6R myself for a couple months now.
Point you may be interested:
1. Hand numbing is a killer. Starting new, riding for 30 minutes my palm is crazily numb.
Now I can do 2 hours. But still numb
2. Engine heat is also a killer. Riding at high noon in a jam, you feet will be roasted to crisp.
The radiator fan only kicks in at 100C!! (any guru knows how i can throw in a manual switch?)
With the ambient temperature at 3+C and stuck in a traffic jam with the hot air blows directly on ur feet.
3. No fuel gauge
Comparing ZX6R with ZX10R, if you have the budget, gut and passion, go for 10R.
With additional 20k on the price tag, u get extra to 6R:
1. Steering damper (ohlins cost about 6-8k if not mistaken)
2. ABS (priceless, 6R with ABS needs to place special order in malaysia)
3. And ofcoz additional POWER
4. and sexier look.
Ride safe

Hand numbing is because the way you ride the bike by letting your body weight onto the handle bar.
Heat is actually from the exhaust. You can try ride my bike with full system termi or stock piping on any panigale or ducati and see how long you can stand the heat. 40 degrees in normal at my place so the solutions is to avoid heavy traffic and switching off the engine at red lights. This will really helps.
Most superbike with no fuel gauge but the tacho will automatically reset to 0 on reserve and from there you can judge the distance you can further go.