Now that I have both 35 & 50 Art i'm thinking of selling my 35 Art (even if it's that good).
The 50 Art is only 2 steps behind for 35mm and the bokeh is better.
I'm interested in a Tamron 24-70 2.8 VC or a Sigma 24-105 f4 OS, purpose would be event photography of models, so the zoom seems more interesting.
Although I saw in an outdoor workshop of Frank Doorhof that he mainly used his 70-200.
Some say the 70-105 range of the Sigma also gives a flattering bokeh to compensate not being f2.8 and the 24-105 is also used a lot in studiophotography.
Although i'm used to fast lenses, if the bokeh difference is minimal I would opt for the f4 for once