But a lot depends on your definition of 'reasonably affordable'.A Summilux pre-asph can do both low light and normal lighting.
If it can be deemed "affordable" the ZM C-Biogon 35/2.8 would be my first choice.
I love my Hex.The most unflappable 35mm lens I've ever used was a KM 35mm f2 Hexanon. Sharp, no focus problems and nearly impossible to induce flare.
Some samples form the 35 Color Skopar in LTM
That looks like a very competent, even-handed lens, in a very modern sort of way.