I think mostly everyone on this forum shoots Canon haha
That's because most of us know the Dark Side wont get you anywhere....LOL
I was shooting at the Grizzly & Wolf Discovery center a few weeks ago and a guy standing beside me was shooting with a 200-400 f/4 VR Nikon lens. This is a very high dollar lens and one I'd drool all over and probably own if Canon made it. It's also a huge lens and very similar to the 500 f/4 in Canon's line-up.
I was beside him with my Canon 400 f/2.8 and I overheard his wife ask why so many people were talking to me about my lens when he basically had the same lens?
I could hear the anger in his voice when he relied "Because Canon makes their lenses WHITE, I dont know why, but everyone thinks just because the lens is white, its so much better than the Nikon stuff."
I had to laugh, and if the guy wasnt so angry, I probably would have gone over and talked with him. But it's true, white lenses get noticed.
As for the 1.8 or the 1.4, I'd save up and get the 1.4, it will probably be faster, and much better in low light situations! There is a reason they cost more