All Revos have been booked out, so anyone who wants a spin is going to have to wait until June at least. Right now, its far too early whether to judge its quality, build, drive etc. Right now the only two things we know about it is its design, and cost. If you want to compare it to Mehran and other models, you'll have to wait until people have driven it and are qualified to make a judgement.
The only person I know who's driven a Revo was PM Aziz