I use HE1000 Stealth at home, I don't really feel like I'm missing THAT MUCH with the PX8, the HEK is more detailed and sounds bigger, but sometimes there's actually too much detail and combined with their brightness can be a bit much. I actually prefer the PX8 with some music, even after EQ. Just yesterday I was listening to "Ellington Jazz Party (Remastered Edition)" and it was kinda unpleasant on the HE1000 which caught me by surprise because I had been foot tapping to that album at work using my PX8 (actually started looking for a new pair of headphones because of this revelation). So yeah, there is a difference, but it's mostly about clunky and analytical vs. convenient and warm.
Even if you don't enjoy the PX8 at first, keep using them, they'll grow on you. Also I'd add +2 to treble in the B&W app, the EQ is ridiculously bare-bones, but that +2 really makes a difference IMO.