Best quality for iOS?

What is the best quality for iOS using UE4?
I tried with the sample RealisticRendering then build to iOS
The quality on PC is not too bad but when I build to my iphone 5, it is really low even I already set cooker to highest quality (took 4 hours to build, normal quality just 8 mins)
I also follow this link to set best quality for iOS iOS Quality Settings through the Device Profile Manager - Rendering - Epic Developer Community Forums
It look like the lightmap already resize (like look like so blurry to compare with PC) and the antialias is not good
How could we change these parametters?

You can see what we did with Unity3D,

Another question: where is the texture of sofa and floor?
How to fix missing texture on iOS?