you defineatly want to give the new R1 a miss as they have about 172bhp and weigh 172kg (yes thats 1000bhp per ton :!: :!: ) and i think the ram air ones increase hp to 182 and their contact patch is no bigger than a clenched fist :shock:
As for the R6, they are fairly nimble machines from what i remember, however a well setup R should hang onto one on the twisties (as you have a higher contact patch on the road, and in theory more grip), but the bike should eek away on the straight if riden properly, and not by a fairy :lol: