Not it wasnt :P
You harly see the reflection but its there.(ady will say: all these will be downgraded when the PT:R comes)
Besides the perspective in ESB is a bit weird so the reflection is not all the time in the glass. Vader is overlap most of the glass area too.(Ady will say: No need to add any reflection, the focus in on the characters and too much work.) :P
-Angel