Hi, here's the deal: I want to get the new Sigma 35mm and a 6D soon. Now I am on crop with a 85mm f1.8. It give me good results but it's hard to get a bad photo from this lens as you only get a tiny bit of background and it's all blurry anyway. The 35mm will be a totally different beast, leaving a lot more place to error.
When I take photo outside, generally street people or urban objects, It's generally a work of intuition rather than precision. I snatch the moment, recomposing the shot in post, cropping in my image to get the framing I want. However I often only realise how stupid I was not to take the photo differently only when I'm in front of the computer. Should I had push that chair 30cm to the left, the photo would have been a winner... Those lines on the carpet totally destroy the comp, I should have turn it 30 degrees, and so on. I bet good photographers take a lot of time, carefully planning every details of the picture. Taking photos after photos to make sure everything is perfect.
Care to share some of your tricks?
It only shows that you don't know how to incorporate the background surrounding as part of your over all shot. Tricks? There is no trick. You just have to visualize how the shot will come out before pulling the trigger, given with various DOF/F stops and shutter speed. That's it. You don't figure out how to take the shot after the shot has been taken. The process is BEFORE, not AFTER. 
and my 
You are shooting street photography. Back in the days, people shoot film with a rangefinder. The photographer becomes one with the street. He or she would try to be inconspicuous as possible. Here, you are reviewing photos with a ipad in the middle of the street??
