We are not talking about a standard one but a remapped one which has the power to weight ratio about 20bhp/ton higher than a Mk5 Golf GTI or Focus ST.
If you actually put the stats into that site for a remapped vRS it says below, most owners get in the low 14s for a 1/4 mile so that seems about right.
Power to Weight Ratio (BHP Per Ton) : 179.58
0 - 60 (Secs) : 6.19
0 - 100 (Secs) : 15.77
60 - 100 (Secs) : 9.58
Quarter Mile (Secs) : 14.60
Terminal Speed (MPH) : 96.21
Drag Strip Quarter Mile (Secs) : 14.40
Drag Strip Terminal Speed (MPH) : 97.92
I still wouldn't buy one as a 1.8T Ibiza remapped which is cheaper to buy would be knocking out over 200bhp to the ton and as already said I would rather have a 182 Clio.
So a remapped Fabia will do 0-100 quicker than the following:
Clio V6
Elise S2 Sport 135
RX-8
Merc CL 500
535i (E39)
Boxster (2.5)
VX220
330Ci
and would do it nearly 5 seconds quicker than a 530i Sport (E39)

I drive a car with 180bhp and about the same weight as a Fabia and I can't imagine it ever being quicker than those cars.