You allied fanboys are allways making me laugh. I can't wait to see your disappointment when your precious little Pershing will be not even of Tiger's caliber not to mention IS2. So no, "axis fanboys" are not fearing Pershing. Panther will dispose of it with no truble at all. And all that axis fanboys will do then, is laugh of your tears. 

Are you kidding? The 90mm M3 is better than the 88mm L/56 and the Pershing has better armor. 100mm at 30 degrees of sloping vs 100mm at 10 degrees which is basically almost flat armor.
The Pershing is better than the Tiger I and can deal with one without any issues at any range.
Oh and the Panther you say? Too bad that the Pershing with the 90mm M3 can make short work of it too at most ranges
http://i.imgur.com/Xt23Z66.png
90mm M3 with M82 APCBC penetrates 120mm of armor at 30 degrees at 457m Source: range.
https://sc-cdn.scaleengine.net/i/b4b8b21f15bf00f8893f157caea2e5831.png
The 88mm L/56 with PzGr 39 penetrates 120mm at 100m and 110mm at 500m. Source:
http://i.imgur.com/LaVvuIA.jpg
The T30E16 HVAP (APCR) on the 90mm M3 also wipes the floor with the PzGr 40 APCR.