I"m using the Xperia ROM, as you can see in my post my favourite ;) : also it's 4.2.2.
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I would have used this one, as it seems near perfect:
http://www.chinaphonearena.com/forum/Thread-ROM-transplant-ZP990-rom-nexus-5-style-to-Inew6000-rom
but I got fc's when clicking 'settings -> apps'; but don't that you put you off, I've 3,5 gigs of apps installed and I restored them using Titanium Backup which probably gives problems on certain apps. Other people are satisfied with this ROM and I'm planning to try it again one day with a clean install.