Well, I'm leaning towards the DA 70mm. Not so much because of the price diference, but I think the DA 70mm will be more suitable for my uses.
For street shooting/candid it will offer better AF speed. I'm a bit scared that I'm going to get annoyed with the FA 77mm's slow AF since I already get a bit annoyed with the FA 50mm on occasion.
My second use for this lens would be landscapes, which means the reported PF problems on the FA 77mm disqualify it. The DA also has somewhat better edge to edge performance from what I read.
If only the FA 77m didn't have that beautiful focus to beautiful bokeh transition...