Given the number of people who got over 60%, and the fact that these were jpgs without direct comparisons I would say the evidence is clear that the difference CAN be seen. As a statistician I would say 60% plus is not going to be expected from random selections.,(I selected randomly, to get 44%, within is within standard error for a 100 N sample)
A lot of them looked like slr to me, not 3d, detailed, sharp without artifacts etc. that I expect from MFDB. Then I remembered a Steinway fellow saying he could make it sound like a Wurlitzer, or Knabe, or Baldwin. I don't think a Wurlitzer piano can be made to sound like a Steiway!
Good fun anyway, and some good shooting (making the point that you don't always need to top tool, as a MFDB (oops, maybe can't say that ! :-)