lens choice: 20mm f1.7 or 25mm f1.4. ?

naftade wrote:

There are people who are ready to start a war over this question.

My recommendation would be to try them both and to stick with the one you like more. That IMHO is the only way to decide this for yourself. I'm telling you from my own experience: You won't come to a decision in this case on so called "hard facts". TRY BOTH!