I ran this test using my V2-SBM1 and a borrowed V3 (thanks Damon). I recorded two nights of Panic at Constitution Hall, same config, same seating position. The only difference was V3 vs V2-SBM1.
My initial impression was that the V3 tape sounded a little bit thin and cold, as if something was missing. The SBM tape sounded more full and warm. After a while though, it became apparent that the V3 sounded cleaner/detailed in comparison and what I had interpreted as fullness in the SBM was just a slight smear.