
I hope you have read Drivers Republic latest "issue". They got to do the comparison we all would like to do and concluded that, essentially, Porsche was right when they claimed something was odd about Nissan's Nürburgring lap times. Chris Harris is a good driver, probably better than most auto journalists so his impressions have more weight with us. When he says there may have been 15 seconds more in the GT-R but certainly not 30, it's believable.
Of course the counter argument will be that the condition for the Nissan driver's run were different, it was much warmer, it was dryer, better driver etcetera so, I imagine this will not put anything to rest.
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read the article and while you are at it subscribe to Drivers Republic.
Here is the GT2 lap, the GT-R's lap is after the jump.