Nope not on par, Vass hand stitches the soles while StC does that by machine so if we follow the same logic as we did before then construction vise Vass > StC. Also I think, but i'm not sure, that StC buys insoles with the feather already pre cut instead of cutting it by hand which is the traditional way and is supposed to create a stronger feather. (Not 100% sure my terminology is correct, if it isn't I apologise.)
I've no desire to get into the middle of a discussion of the relative merits of these two makers but I will observe that the premium look and best practices dictates smaller, tighter, outsole stitching...whether it be by hand or machine...rather than long, clunky, in-your-face outsole stitching even if it is done by hand.
I once had a dance teacher tell me something that I suspect applies across the board, to any aspect of craft or art--"large gestures (movements) look clumsy even if they are intended."
Fact of the matter is...in my opinion...hand-stitching (and I offer it at 11-12spi) brings very little to the game that isn't superficial...and thereby subjective. For me, that's reason enough to learn and master the technique but for the customer, I'm not so sure it's moot.