HHVM still isn't perfectly compatible with PHP. I think the I recently experimented with migrating a fairly complex WordPress site to HHVM (since it claims 100% WordPress compatibility), and I found that some queries would return different results or silently fail under HHVM. So I think not comparing bleeding-edge stuff like that seems fair. It'll probably be relevant in the not-too-distant future, though.
(For anyone wondering about performance, it served pages about twice as fast on average as PHP-FPM 5.4.4 on the same box, and with drastically lower memory usage in all cases. Didn't delve too much deeper into that, though, since the page not rendering correctly was a showstopper.)
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HHVM still isn't perfectly compatible with PHP. I think the I recently experimented with migrating a fairly complex WordPress site to HHVM (since it claims 100% WordPress compatibility), and I found that some queries would return different results or silently fail under HHVM. So I think not comparing bleeding-edge stuff like that seems fair. It'll probably be relevant in the not-too-distant future, though.
(For anyone wondering about performance, it served pages about twice as fast on average as PHP-FPM 5.4.4 on the same box, and with drastically lower memory usage in all cases. Didn't delve too much deeper into that, though, since the page not rendering correctly was a showstopper.)