No, I've never been on an R6, but I don't see why that makes any difference? We're talking about raw HP numbers. Being as HP is Torque*RPM/5252 (in the US at least), it makes obvious sense why the R6 Should make more HP than the FZ6. The R6 has at least an extra 1000RPM of redline room compared to the FZ6, and it continues to make its torque high in the RPM range (see the thread about the R6 cam swap in an FZ6 motor if you don't believe me). Extra RPM's and no torque drop off means more HP in the high RPM's.
As a side note, I don't know why you're talking about race tracks. We've gone from a discussion of realistic HP numbers to "whether or not you can tell the difference." Unfortunately, we're human beings and NOT an inertia dyno, so we aren't very good at determining HP numbers just from a ride...
Since engines require oil, coolant, and gasoline, and brakes, shocks and forks all require fluid to actuate, let's keep our discussion to wet weights. Unless you're going to race your R6 with no fluids, the dry weight means nothing. Also, take posted manufacturer weights with a grain of salt. As I previously mentioned with crank HP numbers, manufacturers love lying about how much their bikes weigh so they can advertise "This bike is the lightest around!"
Additionally, we're all making a ton of sense. If you'd read through the thread, no one has said anything about FZ6 being faster than R6. In fact, if you'd read any of my posts, you would know that I said the EXACT OPPOSITE of this. We're talking about this question, and this question only: Could someone on an FZ6 beat someone on an R6 in a race?
And the answer is yes, for the numerous reasons discussed prior to this post.