Yes thats true, Jens Wilke from nokia claims that Nokia N9 is the fastest image capturing phone with 8 megapixel camera. It will take 2.6 seconds to capture a image much faster than our competitors.
Statement From Nokia Product Manage – Jens Wilke
Once you press the on-screen camera key, the image is taken immediately. It’s the fastest image-capturing phone on the market. In order to take a photo, a series of events must occur: the camera is turned on, viewfinder is ready, focus on the subject and the image is captured. On the Nokia N9, this all happens in 2.6 seconds – much faster than our competitors. The HTC HD7 does all this in 8.3 seconds, the Samsung i5500 Galaxy 5 takes 5.8 seconds and the Apple iPhone 4 does this in 3 seconds. We’ve made sure the camera experience is as smooth and as fast as possible.
Source: Nokia Conversations