I was in your shoes a couple of months ago, Mel.
I wanted to have something that was both 'fast' and longer than 50mm available in my camera bag, for those times when I wasn't carrying either the (quite large) 70-200mm f/2.8 or the 300mm f/4. Intended use was to be a mixture of walk-about/still life/landscape, with the option to use it for formal portraiture too.
I read all the reviews and looked at all the threads about the two, as well as looking at countless example images.
What I learnt from all that was that the f/1.4 (or "The Cream Machine", as some like to call it

), is significantly soft in the corners when used wide open, but is still pretty sharp in the middle and has a bokeh quality that is far smoother than the f/1.8. The f/1.8, on the other hand, was pretty much sharp all over with quite acceptable (to me) bokeh.
In
my case, I thought about the kind of pictures I take and what's my priorities are with regard to image quality :|. Lately, I've really gone off using the biggest apertures on all of my lenses and much prefer making portraits at f/4 or below. Most of the time,
I am shooting against a plain background anyway, so bokeh is a non-issue, whereas sharpness is paramount. For landscape shots (yes, 85mm is sometimes just the right FOV for a particular landscape

), I also want edge to edge sharpness and have no desire to venture above f/8.
So, before even getting into the debate about price, size etc., I already knew that I wanted the 85mm f/1.8. I bought one new for 310GBP and ... it's absolutely what I expected it to be and was money well spent

.
However 
, I looked at your website the other day, Mel, and saw a lot of outdoor portraits (with busy backgrounds) and examples of extreme shallow DOF on still life/detail shots.
I have to be honest with you and say that, for the type of photography you are doing (especially the weddings

), the 85mm f/1.4 would almost certainly give you better results than the f/1.8. You shoot in a way that calls for smooth bokeh and flattering skin tones/textures. If I was in your shoes, I'd use the money to get the 85mm f/1.4, or check out the Sigma version, which (if you get a good one

) is very impressive indeed.
Sorry, I know that won't have helped your decision much

.