Thank you very much everyone for your kind comments, I am glad you enjoyed it!
As far as your questions:
@kikashi: Jeremy, I have seen this immediately in B&W, and haven't even processed a colour version of it. Colours were OK but not great, it wasn't a spectacular sunrise as far as the sky, and the drama of the scene made me think about B&W
@Brookie: the exposure was 2.5 minutes for this one. The colour one in my filter review article has been taken the same morning, but I agree with you - the B&W works better for the scene.
Thanks again, best
Vieri