in which?
while it is likely that the file storage on the rMB and 2015 MBA will outperform the 2011 filesystem, it is really an irrelevant metric since
A. both the new computers storage should be fairly equal
B. they are generally not the bottleneck in performance of either of these computers (and wasn't really a bottleneck in the 2011)
Graphics performance metrics of the new Core M haven't yet been released. Will wait to judge on that merrit, However, I'm not entirely sure anyone buys either MBA or rMB with intent for real performing gaming.
based on expectations, the 2015 MBA should absolutely crush the rMB in available GPU performance.
However outside of gaming, this is also Moot since almost all modern integrated intel GPU's, even the non high end versiosn will provide more than adequate performance for the intended uses of either laptop