I just got a reply from M.Colo on Youtube: he explains that MidjPro and SD7 share the same wavetable. So regarding sounds, SD7, MidjPro and SD40 should be more or less equal.
What you said about the differences between SD40 and MidjPro regarding emphasis on player versus style section was clear of course.
I believe that the SD7 and the SD40 have more sounds than the Midjpro.
They have some RAM sounds for instance which the Midjpro doesn't have and I also think that they have more ordinary built in sounds too.
I do know that the SD7 has more styles
I do wish Ketron would hurry up and confirm exactly the full spec of the SD40 and how it compares to the Midjpro.
Tony