28mm or 35mm prime?

[Solaris]

So I'm pretty new to all this, shoot a lot of portrait with the Canon nifty fifty on a 600d.

Just want something a little more wide angle, but really can't decide between the 28mm and 35mm lenses. And can't get my head around why they are so much more expensive than the 50mm.

I'm also trying to stick to EF lenses and stay away from anything EF-S in case I want to go full frame at some point in the future.

 

[Solaris]

Yeah I've read that a lot about the 28mm 1.8. Apparently it isn't as bad if you use it at f/2.2

The 40mm pancake I've heard good things about but would probably be too close to the 50mm for my liking.

 

[Solaris]

Ahhh I was going to see how my photography is going, do a few courses, then commit to a 5d mk III in January 2014 with a fat bonus that I've got coming.

I've already been told a few times how much better full sensor is which is why I'm shying away from anything EF-S.

I think I'm going to bite the bullet and go for the EF 28mm f1.8 USM. Then it will still be useful when I do switch to full frame.

Cheers guys