I find it interesting that whenever the 1M is compared to the Cayman it is always the R(a car stripped of NAV, radio, AC, sound deadening material, aluminum doors and even nylon straps instead of door handles.) Power? A whopping 10 horse increase. Many Porsche purists feel it was not even worthy of the R moniker but nevertheless, a lot to sacrifice just to be able to barely beat the 1M. The GTR comparison is flattering but we all know the GTR is way out of the 1M's league in almost every aspect.
The way I see it, the comparison should be:
135i(sport pkg) vs. Cayman
1 Series M Cpe vs. Cayman S
But I don't think Porsche would like the results.
Cayman
< 135i(sport pkg)
< Cayman S
< 1M
< Cayman R