When I chose my PX year ago, Sennheiser M2 was the closest rival (Sony XM2 and Bose QCII were not anywhere near - sound wise). Here is PX7 vs Sennheiser M3: I (as a "good tight and precise bass" pedant) think he evaluated all just right (you can start at 21:20 where SQ starts and then...

@Tenlow , exactly same feelings, man. When I was in a testing phase, I had 4 pairs of BT headphones on table in the store to try out: PX, XM2, QC35II and Senheiser Momentum 2 Wireless. ANC off (I have them for my quite office) - sound quality: only PX and M2W passed - the other two (XM and QC)...