Funny you should mention that, my 997.1 T4S owning mate threw me the keys yesterday and I went for a play. I have to say that it's still a fantastic car, but it's not for me. The weight of the glass at the top does blunt the handling, as does the softer springs and too harsh damping of the gen1 cars. Throttle response from low down isn't as good as mine either, but then it's the older engine. There's certainly more grip in the wet round tight turns, but it just didn't feel as fun to play with as mine, a little too easy to drive quick IYSWIM.
It's odd, that makes it sound as if the 4WD gen1 is awful, but it's really not. It's utterly superb, and possibly the best all-round sports coupe you could buy for sensible money. It just makes me appreciate the little differences of mine even more, and I know I was right to pay a little (lot) more for the newer car.
I do need to drive a 991 4S I think, I'll have to speak to my local OPC and see when they're getting a car in. I'm at the Cayman launch there next month, might pester them then.