[obican]

I prefer ultrafast lenses for full body shots, like this:

 



 

Ok it's not a person but you get the idea.

 

 

An f2.8 lens may not be great unless stopped down to say f3.2 or f4. But an f1.4 lens is almost certainly going at its best at f2.8.


So, there are other good reasons to get a faster lens, other than better bokeh/shallow dof.


You are not getting a worse lens by going faster. On the contrary!


And this is why they are more expensive.

 

Sony 85/2.8 is a little piece of gem that is probably as sharp as any fast 85/[email protected] at f/2.8 so there are exceptions and this one is quite a cheap exception too.