You might want to check on the price of the 1.4 as opposed to the 1.8 I know for nikon there is a big price difference between the two. That being said the 50 is a nice lens cause it is cheap but really depending on the size of the rooms you are thinking about shooting in the 35mm might be better suited for your purposes. I am sure the image quality of both of them are pretty good.
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Rex K
The view from my "office" doesn't suck. 
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