What does switching to responsive ads mean to a publisher. It means faster page load = better user experience = happy reader. Responsive ads have no connection to your Revenue !
Sure for me I was neglecting Adsense recommendation of switching to better performing ads, so now I have defined only those size in my Responsive Ads e.g.
336 X 280 Large Rectangle
728 X 90 Leaderboard
468 X 60 default (for IE)
320 X 50 Mobile Banner
Responsive Ads also helped me in reducing my Adsense Channels. Its my personal belief that less Adsense Channel are better. With less channels I can focus better on performance. With less channels I get more ad impression per channel so better for attracting advertisers and in turn affecting my Adsense revenue !
I think Responsive ads are great, both for publishers and readers. So while Adsense guys work to get ad size breakdown in performance report for Responsive Ads, let me try some A/B Testing and other stuffs..
Wish you safe switching to Responsive ads and more Adsense revenue.