Dr.Horrible
Member
The Sigma is a smidge wider (not really a factor), is sharper, and cheaper. Can also be used on an A7, with caveats (I do this).
The Sony 35 has stabilization, opens wider, so is much better in terms of how it handles low light, and will also focus a bit quicker, but is more expensive.
Aka Sigma for value, Sony for quality.
The 19 and the 30mm lenses are different enough focal lengths that sure, if you have the cash and want that extra width, no reason not to get both.
EDIT: If you like landscapes, and this is the primary usage of your next lens, consider a wide angle -- if you're usually around the 16mm end on your kit lens (I assume that's what you are using atm), then Samyang makes some fantastic wide angle ones, so that might be worth a look. And since its landscape, manually focusing won't be a bother... Mountains don't exactly move around a lot.
Would you mind explaining what you mean by saying the Sony will open wider?
I'm looking at these two specifically.
https://www.amazon.com/dp/B0096W1P5W/?tag=neogaf0e-20
https://www.amazon.com/gp/product/B01C3SCKI6/?tag=neogaf0e-20
The Sigma is f/1.4 vs the Sony's f/1.8.
Lastly, this is the 19mm I'm looking at.
https://www.amazon.com/gp/product/B00BPZD0M4/?tag=neogaf0e-20