IMO Metallica is easily the best playfield art on a recent Stern. To me ZY's pfs are still trying to cram too much in, both art and colour wise, and don't work quite as well.
The Premium and LE cabinets on Deadpool do look fantastic - I'd say best on a Stern ... though decal and print quality to be determined.
IMO, Zornow has set a new high watermark for recent machines with pf, cabinet and LCD work for Alice Cooper.
But if we think back a few years, these guys amongst others (Franchi / Youssi etc) are all top notch,and producing far better work compared to the bad years.