If anything, all (or all but one) PHX
flights are at least old America West flights, which tend to have a little bit better service in first. I've never sat up there on HP
or US myself, but at any rate, last year I was in a forward aisle seat in economy and could see through the mesh curtain that they were at least using real plates and silverware (except possibly plastic knives). But if you are on the one flight operated by the old-US (US east) then I don't know how that is at all.
The F/A serving in first class on that flight, despite being 130 years old, had a smile on her face the whole time, and was nice to us back in economy those few times she came back into our cabin (she was in F for most of the flight).