I'm really torn between these two lenses

They both are apparently really sharp, just as sharp as each other. the obvious difference is the f1.4-16 vs f1.8-22

the Price difference is my main problem lol. I can get the f1.8 for about £80 or the f1.4 for £200

I've had a play in the camera shop with the 1.4 and it's really nice, just wondered if anyone else has either of these lenses, and what they thought of them.. I can just about scrape up enough to get the £80 one lol, or save longer to get that £200 heh.

does that 1.4 make that much difference?

ie, is that 1 or 2 stops of light difference?

and how much more of a shallow DOF will 1.4 give you over a 1.8?