I should think that Mike's comparison of 70 vs. 70.2 would translate neatly to the 30 vs. 30.2 differences. After all, both machines benefit from the same new front-end circuit, part refinements and such. There's really no need to insist on an actual comparison against another unit that's discontinued now. We do aim to please but some things are asking too much at times 
With all respect, isn't it fairly common practice in hi-fi reviews of certain product to at least on some level to compare it to it's possible earlier model? Have not seen single Rega Apollo -review without some comments on how it compares to earlier Planet/Jupiter models (discontinued), same with upgrades; every Linn LP12 SE upgrade-kit review tells you exactly what you'll be gaining from the upgrade, not just how it compares to other similiar priced/voiced products.
Sure, most of those comparison are from reviewer's subjective audio memory, but as 6moons.com is above your common hi-fi mag with it's excellent in depth reviews, one (or then just me) would expect the review of upgraded product to include good comparison to previous model too. Especially when the said product received such praises.
But hey, beggars can't be choosers, not paying penny for reading the best hi-fi publication out there
You do as you see fit, it was just an wish from enthusiastic Sig30 owner and 6moons.com reader.
Looking forward to Mike's comparison of 70 v. 70.2.
EDIT: Just to clarify; it's not about if I believe the upgrade will improve the sound or not. I'll defo upgrade my Sig 30 to 30.2 at some point, but I was wishing for throughout review of the gains of the upgrade to learn if I need it right _now_ or if I can wait till spring when it's easier to bear the time without my Sig 30 while it travels to US and back