[dave9t5]

I for one rarely shoot over f/4 with wide angles.  Faster apertures make plenty of sense on wide angle, if not more.  Long lenses have plenty of shallow DOF.  Wide angles have trouble limiting DOF, so the faster the better please in order to isolate subjects.  

 

Most WA zooms have poor min. focussing distance so I stick with primes.  Getting closer is another way to gain WA subject separation.

 

15mm f/4:



 

14mm f/4:



 

10mm FE f/3.5:



 

10mm FE f/4:



 

 

Hmm, a lot of drink photos....here's a non-drink photo:

 

15mm f/4: