Howdy,
When I tried them both on, the only difference that stood out to me was the tongue. That definitely changed the way the skate seemed to fit my foot a bit and resulted in a little different feel. it wasn't better or worse to me, just "different". Just trying them on, I obviously couldn't evaluate any difference in the steel. I couldn't tell any difference in weight whatsoever.
For me, the extra $$ wasn't remotely worth it and after 3 months of reasonably heavy use (playing and reffing) I'm not sorry I went with the TF7's. YMMV.
Mark