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I have to disagree with you.
Having ridden a few gsxr 6 and 75 and 1000 back to back and a few of the k series and they got easier to ride, out of the box, as they became more modern. But to me there were never that great unless the suspension was properly set up... Engine wise a well set up 1000 will run rings around a well set up 750. By well set up I mean balance power through the rev range not all top end.
lynx-
The 1000s are all absurdly grunty. I've had k3, k5 and k6 Thous. The k3 was probably the sweetest handling though had been very well set up before I bought it. The k5 and up models are smaller, have much better legroom and another 15+ hp with absurd midrange.
I've only tracked them a couple of times but I doubt I'd be much slower on the 750. Thousands are just fucking knackering to ride...fun but wear you out really quick.
Jung
By the by - I disagree totes with this. The 750 has been wicked since the very first SRAD. As a road bike it got even better after supers switched to 1000s - much longer stroke motor tuned for the road. Way more flexible than a 600 and a boat load quicker.
A (very) well set up first gen FI 750 proddie racer is still probably the best track bike I've ridden. Fast but you could still get after it and the sweetest steering imaginable.