One thing to be careful about is comparing
old tyres to
new tyres. Combined with changing models and you actually have 4-way comparison, not just 2. I did following change and noticed major improvements for all of them, even though one of them was exact same model tyre:
pre-gen: Dunlop K630 -> Shinko SR740/741, Wow! great handling, braking & cornering!!!
new-gen racebike: Pirelli Sport Demon -> Shinko SR740/741, amazing improvements, 1.1s/lap @ Laguna Seca!!!
new-gen commuter: Bridgestone BT45 -> Bridgestone BT45, woohoo!!! much better braking performance!
Just from switching out
old BT45 for
new BT45 made significant improvements in grip and braking on my commuter. BT46s weren't out at time, otherwise I would've gone with those. Got 16K-miles out of BT45 on my commuter!