G'day Steven and lazerin.
Yes, very different beasts as you suggest, whilst still fundamentally similar. Flying the -400 is very much more a systems management role, with manual input (flying!!) being fairly much limited to the departure and arrival phase. Sometimes, not even very much of that. For example, departure from London, due to noise abatement and noise monitoring in that location, our company procedure is engage an autopilot at 250' AGL to ensure accurate tracking of the Standard Instrument Departure (and stop us getting noise fines!)
After a long sector from London to Singapore, Bangkok or Hong Kong and being tired with perhaps a bit of weather thrown in to the mix, it is sometimes more appropriate to do an Autoland with no direct control manipulation (other than gear and flaps and quite a bit of talking back and forth).
Compare this to the lovely little Sportstar, and I guess any of the other RAAus aircraft that we all have a soft spot for, and I know which one I would rather spend my time in! I have loved doing my conversion and enjoying the freedom of flight once again that only a private/hired aircraft can give.
I look forward to spending a bit more time in the Sportstar in future, as well as getting to know the Gazelles down at Caloundra, as well as some larger GA aircraft at Maroochydore. Can't believe I left it so long to enjoy all of this!
Safe and enjoyable flying wishes to you all.
Mike.