The leg rest comes basically all the way up but it's a tad shorter than a recliner. For me the way it supported my legs wasn't too comfortable (supports until halfway of my calf). I think the recline wasn't too bad and I was able to get some sleep, but overall I won't say a "comfortable sleep" - that would be a lie flat business class and above.
Were you in the first row of PY? I wonder how first row differs vs the other rows in terms of the leg support.