I think the cap world makes it impossible to even compare the two eras. While I don't think Sid/Geno will ever dominate as much as Mario/Jagr, I also would like to see how Sid/Geno could do with the actual supporting cast that Mario and Jagr had.
I mean, we're salivating at names like Setoguchi, Stewart, Ryder, etc. Meanwhile, Mario and Jagr had names such as Stevens, Tocchet, Francis, Kovalev, Nedved, Mullen, etc. to play with.
Could you imagine the damage Sid and Geno could do if, hypothetically, Sid had a prime Stevens and a prime Tocchet on his line, while Geno had Neal but also a prime Francis on his line?