Im looking for am all round lens which probably will mounted to my camera most of the time.

Im in dilemma which fov to choose.

Mostly what i take the most are landscape, street, food and casoul portrait.

Any advice if i can only have one of these 2?

I would go with a nifty fifty equivalent lens
sigma 30mm f1.4

I find 16mm (25 ish on crop) too wide for anything besides landscape. Maybe for wide angle coverage just pick up a used kit lens for the meantime ba

30mm1.4.

used twice at a6k.

In general,

Landscape = 16mm (24mm)
Street = 30mm (45mm)
Food = 30mm (45mm)
Casual portrait = 30mm (45mm)

Just place your own weightage on which is more important.

I feel 16mm (24mm) would be better for food.
If you're not sure how 16mm (24mm equiv) would look like, try looking through your phone camera and see if that what you prefer. Most phone camera comes with 24mm equiv angle.

But bear in mind the 16mm f1.4 is quite heavy and long at 405g vs 264g for the 30mm f1.4

Smartphones, 24mm equivalent, makes it simple for people to take pictures due to less distance required, but it distorts perspective quite noticably. I think food photography should have less distortion by default, unless it is a creative choice. I have tried taking with 35mm equivalent, but somehow find even that has much distortion to my eyes.

+1 for this. Sigma 30/1.4 for sure.

Maybe not the best for landscape but if you have the kit lens anyway, you can use that first. In fact, for landscape, get a good tripod before lens

my vote goes to the 30mm f1.4 as well, especially if you don't do much landscape compare to others that you've mentioned. Dont forget that you can do panorama shot with the 30mm if the situation call for it.