ive never driven a vr corrado but can imagine it would be about the same as a 'stage one' g60, only with added fuel costs.
From experience, VR6 is a little sluggish low down in standard guise - the MK2 KR, though slower, felt so much more lively from the off, though the VR takes off from about 3.5k rpm. For all that, expected MPG around town and on the commute is about 25mpg, and it will settle in the low thirties for a quiet motorway run
G60's can also be modded pretty cheaply, whereas on the VR you need to get a Schrick manifold, 268 cams and a remap to make it come alive, or supercharge/turbo it if you can afford it. I've just put the Schrick in mine and it's transformed the car, brining in the power much earlier.
Costs-wise you have a charger overhaul every 60000 miles on the G60, but then there's the chains on the VR6 every 100000 miles or so which cost £1500+