[EDIT - CAUTION] The graphs below are not to be trusted. They aren't comparing equivalent systems, for a variety of reasons explained in this thread. I'm leaving them up, but readers should not take these to mean that AC is worlds better than DC. (There may be other reasons to think so, but not these graphs.)
Here is my first piece of data to fuel this fire. It compares the D&D ES-15-6 (series) vs HPEV AC-15 (drop in replacement induction). Also shows graphs with 300 and 180A limits (5c and 3c for 60Ah).
Note that this is using ElMoto spreadsheet 2.18, straight from manufacturers spec, no current limits imposed (apart from what is in manufacturer spec). Otherwise, all bike specs are the same (weight, drag coefs, etc.)
From manufacturer spec, current at max torque is: AC 550A, DD 480A
Also note that AC curves drop off after ~90mph (6000 rpm) because I don't have data for that area. Please ignore this part of the graph.
(One more thing: I have shifted the curves to the left - I believe this is correct so that kW curves cross through zero at 0 mph. The lines should extend to zero, but they are cut out of the spreadsheet chart)