Do you know....as soon as I saw this thread title I just knew it would be splattered with MKII owners. Even before I looked at the posts, I knew who'd be replying

Stock MKII v's stock MKV ED30 = no competition ED30 wins
Modded MKII V's Stock MKV ED30 = ED30 win or lose depending on the MKII mods and driver.
Modded MKII V's Modded MKV ED30 = Very interesting whichever way it goes

I've not seen a MKV GTI or Edition 30 go down the 1/4 mile in under 12.6 seconds in the UK, but I have seen plenty of MKII's go quicker

That may soon change though
