For Discussion - What was the key feature that drove you to upgrade from your previous camera?

Today we're going to start something new - a discussion post. We'll post a topic and you're invited to sound off on our Facebook page.

What was the key feature that drove you to upgrade from your previous camera or caused you to choose a higher end model in the lineup?

Was it the AF system? Full-frame sensor? Burst rate? Build quality, weather sealing, electronic level, or something completely different?

Tell us what the catalyst was for your upgrade (and why) on our Facebook page.