I don't know. I've got to give Kittinger the "brassballs" award for jumping out of an unpressurized gondola at 100,000ft 50+ YEARS ago!
Ok, not supersonic and 120,000 ft for Baumgartner, but Kittinger survived a flat spin at 22 g's in an early test flight. Gak!
Supersonic in 21st century spacesuit pales next to a guy who took a step out of that basket with 50's technology!
(Oh, and Kittinger ended up surviving the Hanoi Hilton....)
I think Kittinger is advising Baumgartner on this jump!
Every bio about Kittinger that I have read, indicates he is the first one to break the sound barrier without an airplane around him, on the jump from over 100,000 feet.