For me, there's nothing to dislike about Summarit. I love the glow and I love the swirl, but I can understand that if it's your only 50mm, you'll find it limiting in some circumstances, but since I only have 50mm lenses, I've tried to combine different flavors of them and the Summarit compliments the Summilux ASPH. and noct. very well i think.
Another nice one would be the Nikkor S.C. 50mm F/1.4, but that's even harder to find in good condition.
I was hooked after I saw pictures of a friend taken with the Summarit, just ordered mine yesterday after looking around for what felt like ages, hope I'm lucky with the glass and everything.