I saw this yesterday in Cheltenham. It was the F-Sport, black with Garnet Red Leather.
Brilliant, it had the 12.3" screen and ML Audio. I sat in the drivers, I'm 6'5", the passenger, Lexus sales person Dave, was 6'3", behind him was another guy, 6'2" and his wife sat behind myself. We all had plenty of space. When i sat in the rear, i had plenty of head room. Although, if a 3rd person was to sit in the centre, their rear would have to be less than 30cm, so fine for a child, or posh spice.
The dash layout is excellent and the mode changes to sport with the dials changing to rev and glowing red, very nice.
I boot is very large, but not having seen the old GS, I can't comment, but Dave did say that they no longer have to be worried about the boot size putting buyers off.
The styling is fantatic, just my cup of tea, very IS, but a little sharper.m the od feature is that the F-Sport has no front fogs!
If you have a chance, go and see one, you won't be disappoint, and it if have £53k to spend, I don't think you could buy a better equipped car.
In a few years time, mine will be the 450h, but I'm not sure if it would be the premium or the F-Sport. I have some time to ponder on that.
Chris