I can only speak for the ones I've tried. The Z7 knobs felt offensively bad to me. Aluminium is a bad material to make knobs from - it's so light that they feel like plastic anyway - the only thing that gives away the fact that they are made of a metal is that they feel cold if they've been in a cold room.
I haven't spent enough time turning the pots yet but one thing I noticed was they all felt different, especially in the detents. The inconsistency is a tactile turn off for me. I'm hoping that fitting some decent quality knobs with some heft to them will improve the feel.
On the other hand, I don't have a beef with the knobs on my D5 - they are nice flat top barrel knobs which are a bit slimmer than your typical Fender types. The pots feel positive, smooth turning but with a reassuring resistance/inertia which gives a quality feel. Mind you, it's hard to fsck up a passive VT circuit