Ahh, ok, if we're ok to reveal, here's my feedback:
#1 - Nothing special. Lacks life.
#2 - Too punchy/poppy in the low-end and little life in the rest of the spectrum. Dry and Veiled.
#3 - The best master of the collection; although there's a bit much compression/limiting in the kick/bass area. It has life. Musical. I would guess this was the Professionally Mastered version.
#4 - Veiled. Better balance than #2, but still lacking a real life.
#5 - Closest to #3; musical and warm without being veiled. However a bit too compressed in comparison to #3.
#6 - Again, nothing special. More like #1, although slightly brighter.