Never owned the Glashutte, but have owned the standard Black 45mm FF and now have the Blue titanium FF. What can you say, a brand with a rich history, superb build quality and one of the cleanest dials around and attention to detail is superb. The 45mm as stated many times wears more like a 42mm watch and comes in a choice of bracelet or Sailcloth with buckle or deployant.
I'm sure someone will be along soon to say how marvellous the Glashutte is, but in all honesty for these kind of watches wouldn't it be worth the effort to go and see both in the flesh.