Agree completely. There is simply no data that shows the T-34 series is much different at all to a Sherman series, and vice-versa. The T-34/76 is very close to the 1942-43 versions of the Sherman, and the later T-34/85 is very close to the 1944-5 versions of the Sherman (the 76mm armed ones). Despite some of the extremely nationalistic bias in some posts, that are not based in fact, but what country we "dont like".
You can quibble about a few mm or armor, or maybe the crew ergonomics and radios, but past that, there isnt much there. Both tanks had their strong points and weak points, which have been endlessly discussed and pointed out. Almost none of the differences ammounted to much on the real battlefield.