4. Someday. I am not big into landscape photography, but someday I will round out my filter
collection. Right now the only kit lens I have is the much maligned* Oly 14~42mm. Polarizers and graduated ND's don't work well because the front element rotates when focusing. Any adjustment to the filter causes the lens to refocus. I have my eye on two primes, the Panny 14mm and the Sigma 30mm 2.8.
Most of what you see me post is done with legacy glass.
*Slow AF and the rotating front element. Someday it will be replaced with the Panny 14~45mm.