I will own both + corvette
I own a 2013 TT RS (actually up for sale as we write) and it is a bundle of joy to drive. And while it is fast as almost anything on the street up to a point, at about 60-70, the I5 RS starts to lose out in comparisons to V8s. I know first hand because my other car is 2013 427 convertible corvette. I have just ordered 2016 F type R; and while my experience driving the Jaguar was just with demo, I would say the comparison would end up just like the 427 (acceleration seems similar to vette). I thought I was going to buy new Z06, but with the 2016 Jaguar getting AWD there was no comparison for someone living in Wisconsin. Snow tires here I come.