That's high for a large body airliner, but some smaller business jets can go higher because they have better aerodynamics and engines. Service ceiling figures from wikipedia:
Gulfstream 550 and Dassault Falcon 7x: 51k
F14, F18, B52, and B-2: 50k
F15, F16, F35, B-1B, Su-47: 60k
F22, Typhoon, and PAK FA: 65k
U-2: 70k
SR71: 85k
A380, A350: 43k
A340, A330: 41k
A320: 39k
Boeing 787, 777: 43k
Boeing 757, 727: 42k
Boeing 747-400: 41k
Boeing 737: 35k
The 85k for the SR-71 is the unclassified information that has been made available. Rumor has it they hit 100k+ with the SR-71. Figures on actual ceiling for the SR-71 flights that were made have never been made public.
