Yes and no. I have all sorts of test results for the 4.x kernel, but they are for i3 instances rather than i2.*, so they wouldn't be directly comparable. Your question kind of makes me think I should put together an updated version of this talk; I've gathered enough material over the last couple of years that would probably be useful to somebody.
This was my first thought, kernel 3.x is more than a little dated now and there is a huge amount of IO performance and latency related changes that have been incorporated since the 3.x days.