(source "html5test" , http://html5test.com)
On ios 5.1.1 with a Iphone 4 :
The actual dolphin version score
"339" (and 9 bonus points)
So i think it was still using the safari "core" to work because safari have exactly the same score !
I will try to get the new "dolphin beta engine" and also the "Chrome on ios" to do further tests !
Don't try to confuse yourself, Android and iOS aren't same, besides Android was slower than iOS but better support to make custom internet browser.
iOS doesn't allow you to make a custom browser if you're a iOS developer, just use safari core with different UI.