I can't speak for NXT (or XCP, MSC etc), and we have good relationships with everyone in the field. Personally I see our future interactions as collaboration, not competition.

I think the vision we have for ethereum is unique, even 6 months after our original announcement. The core idea is to promote the development of dapps by making it very easy for people to leverage skills they already have: JS, HTML or QML for the frontend for example. The contract part also has a low barrier of entry, by using a VM and enabling several higher level languages (Currently GO-like, python-like and lisp-like).

As I was saying in previous post, I remember, being a developer myself, being quite frustrated it wasn't easier to build the cool dapps that have been envisaged in the last 18 months. I think making the build process near-trivial will accelerate innovation in the space quite dramatically.