Yes, I have an external e-ttl flash. It's a cheaper YN-468 II, but I have been happy with it so far.
I am really leaning to the 85mm. I brought my 50mm 1.8 out and took a couple shots of my youngest today (11 months old) and the image quality and sharpness are a bit better over the 28-75, with both wide open. I appreciate all of the feedback.