In terms of AH, think of the Panther as being almost indistinguishable to both the Firefly and Tiger for AP performance. The armor of the Panther will be very similar to the Tiger and far superior to the Firefly, at least in the front. It *should* have more speed, I've seen speeds of 29mph to 35 mph listed vs 25 mph for both the Tiger and Firefly. Reload times, if HTC goes "by the book" as they seem to do in this category, should be right at 6 seconds.
The gun of the Panther tank is the 75mm Kw.K.42 L / 70. The gun of the Panzer Mk IV is the 75mm KwK.40 L / 48. The projectiles are the exact same thing (PzGr.39 @ 6.8kg and 7.5cm), but the case of the KwK.42 cartridge is a bit bigger than the case of KwK.40 cartridge thereby holding more propellant and producing 200m per seconds more velocity (740m/s vs 940m/s).
The Panther (vs the Pzr IV) will be able to penetrate 30mm more armor at 1000m, 27mm more at 1500m, and 26mm more at 2000m.
Anyone want to bet this thing is perked MORE than the Firefly and only slightly less than a Tiger? I'll wager 5pts LESS than the Tiger. You heard it here, first.