The later ones with the chrome ring seem to be more resistant to zoom creep (in my experience at least). I have a chrome ring version which I have used for years and it is still pretty tight, just the barest amount of creep at steep angles.
I noticed that the amount of zoom creep depends on humidity - the felt ring which provides resistance to the zoom ring dries and shrinks in low humidity so the zoom creep becomes worse. I discovered this when I received the lens (bought on ebay), it was looser than I hoped, but it tightened up after a few days. I guess it came from a very dry climate, the felt strip must have swelled up a little in the wetter NZ climate.
This lens does show some weaknesses on DSLRs. Colour correction could be better, there is some lateral CA I have some pictures which show LoCA and "colour bokeh". When shooting sunsets there is a faint ghost image diagonally opposite the sun which I never saw when shooting film. But generally it still performs very well.