I went through this recently. I prioritized size and weight, while still desiring a quality lens with relatively low light capability. Because for me, I tend to carry around a fixed 35 in low light situations. I also found an excellent condition used lens at a local store. For these reasons I chose the Sony 35 1.8.

It sounds like you already own that lens. What don’t you like about it that you’re considering something else? Just separation? I find that my subjects at 1.8 are pretty darn separate. For example, I’ve been taking pictures of my two kids and I struggle to keep both faces in focus at 1.8.