Sherman v Pz IV, is there a rating problem?

[otto]

My perception is that if you rate 4 the armor defence value of the Sherman you should downgrade to 4 its AT fire value. After all the Grant has only 4 (same gun, Am'I wrong?).
In terms of "duels" against PZIV 3 - 5 is more or less equal to 4 - 4.
However this feeds also on the comparison between Churchill tanks armed with the 6pdr and Shermans. To my knowledge these tanks performed quite poorly in terms of infantry support but were considered better than (or at least equal to) 75mm Shermans in terms of AT capabilities.
So overall I think that 4 - 4 would be better. BUT not really worth changing the values of thousands of already printed counters!