Good Morning All-
KWilliams, interesting post. My mint Honda CBR 600F2 has been shod with each of the tires you've mentioned, with the exception of the Pirelli model.
In terms of usable grip, predictability, wet performance, durability, and suppleness, the Metzelers are simply fantastic. I changed to Dunlops about 2000 miles ago when my rear Metzeler was damaged by a large screw when riding at about 70 m.p.h. Because I was limited to what was in stock at the closest local shop at the time, I decided upon Dunlops due to their excellent reputation in racing circles.
You know what? The Dunlop D208 ZRs are probably unbelievably great at the edge of the performance envelope, but I believe the Metzelers are superior in every other category. The Dunlops feel skittish and somewhat vague...not the "locked-down" feeling one gets with the Metzelers. Another concern of street riders who might get caught in the occasional rainstorm is wet performance. The Metzelers seem to have the silica balance all figured-out because they're fine in damp conditions.
For some completely unscientific commentary, my car has some sticky Michelin Pilots and they are wonderful. If I was to encounter difficulties obtaining the latest and greatest Metzelers for my bike the next time around, I would probably look at Michelin Pilots second. The only theory I can offer is that Metzeler makes tires ONLY for motorcycles, so they have to smack the ball out of the park each time at bat.
Hope that helps,
~ Blue Jays ~