After owning an 8v for over three years and now a 16v the 8v definately felt like it had more torque down low but can't compete after around 3k. For city driving the 8v was nicer and gave a decent amount of shunt even when being driven lazily whereas the 16v does need to be wound out some more.
Economy wise I used to get around 35mpg in the 8v compared with around 33mpg in the 16v so not much difference there. Both were of a similar age, T reg's (registered 2 days apart) and I had the 8v from 62k until 109k when the gearbox grenaded, the 16v I got with 68k and has 72k now so they should hopefully have had a similar amount of wear and tear.
If I am honest there isn't really anything I miss about the 8v in comparison, although pace wise there wasn't a huge difference between them the 16v is just a much more fun drive. The bigger 280mm brakes on the 16v also do make a nice upgrade over the old 8v's.