In Australia, where the median latency to the rest of the internet is 200-300ms the difference would be remarkably higher. On this page, I get 5s vs 1.5s.
Seconding this (also in Australia, behind several corporate proxies). I am getting ~7s vs ~2s.
I didn't realise before how http2 will improve things for me, but you're right about Oz. 8.25 vs 4.36.
HTTP/2: 1.09s, 0.87s, 1.19s, 0.92s, 1.30s = average 1.07s
The slowest of five HTTP/2 results is still faster than the fastest HTTP/1.1 result, and on average it's nearly 50% faster.
(I'm on a 37 Mbps network in New York, using Firefox 40.0.3 on Windows 8.1 with a cleared cache.)