For my own air testing and swapping coils on mx5 and mxt all pro to and fro i got the same distances for nickel and quarter on each unit of about 10.5 to 11 inches for nickel and 10.5 inches for quarters. The inch offset between their measurements and mine probably are do to how quiet their environment is or the calibration they did or something of the like. I might have it not as tuned or as quiet as theirs but i think actually mxt and mx5 look pretty equal in the std non-boosted gain ranges, except mx5 is much more emi sensitive as they show in the video.
Also it appears they used the default coils on each system in the test. My best readings for air distance on mx5 and mxt were with the mx5 concentric coil. So its not surprising that mx5 with the concentric got 1/2 inch more in distance with the nickel and inch more than quarter.
But what is interesting is that side by side they are getting 1.5 inches more than mxt between mxt all pro and mxsport. That makes me wonder about finding smaller targets or maybe enabling prospecting capability to find smaller penny nuggets with the sport than mxt.
Also curious to test then the mxsport with the accessory loops steve has listed. If it does better with concentric coil in the air then i want to really see how it does in different grounds with the different loops. As john mentioned 12 inch loop, or a smaller elliptical trash hunting loops, or concentric loop.