This is what bothers me with diode comparisons in general. The forward voltage is obviously the leading factor in the clipping but is actually the easiest to ad

This is what bothers me with diode comparisons in general. The forward voltage is obviously the leading factor in the clipping but is actually the easiest to adjust through biasing the diode. It would be far more interesting to bias them all at the same forward voltage and then see how the other characteristics (leakage, capacitance, recover time, etc.) impact the waveform.