I didn't get the W850i as originally planned but now have a W880i. I figured someone would like to see some RMAA results for this Walkman phone.

Results
Test taken with the latest firmware as of last weekend. The phone has an update facility built into it which is nice.

All Tests

Collation of results

I've not used the phone much for music so can't really comment other than there isn't the immediately noticeable hiss that you get with the W800i. But, don't get too excited though since I've heard some strange distortions (possible clipping) on loud portions of music that I'm concerned about. It should be noted that I'm not sure if this is a headphone problem or not as yet. I'll be back with more information (with proof if it's a phone problem), probably next weekend.