"The only things that climb like a SpitXIV are the G10 and the Ki84. Period. G2 is nowhere near XIV, nor the G10. Both of those planes WAY outclimb it."
In the world of AH, they are indeed very close. It goes on up to 20K at least, - I measured some 10 secs or so between them.
And a little edit: I should have measured up higher, for at 20K, the 109G2 was still on WEP.....