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by ampersandy 4483 days ago
There's a good write up (in Russian) here: http://habrahabr.ru/company/vkontakte/blog/214877/

As HHVM is more performant than HPHPc, it's a more relevant comparison. Even then, it's not entirely apples-apples since HHVM supports (almost) the entire language, whereas kPHP seems to only support a subset. Doing so likely lets them make a lot of performance optimizations you couldn't make otherwise.