http://www.nikonchat.com/nikkor-f-1-4/

What would be best Nikkor lens for Nikon D5000? 50mm f / 1.8 f / 1.4 or?
I'd like a new goal and I need help deciding each of 50 mm f / 1.8 or 50 mm f / 1.4. I know that the D5000 can not autofocus on the f / 1.8. Can someone please explain whether the D5000 can autofocus at f / 1.4? I wonder if getting the f/1.4 is really worth it if it could auto focus. Okay, so I learned that I must get ƒ/1.4GS a 50 mm AF lens autofocus. Is it really worth it to get the AF-S instead of a lot cheaper than 50 mm f / 1.8?
I would suggest you buy nikon 50mm f / 1.4 http://www.amazon.com/gp/product/B001GCVA0U?ie=UTF8&tag=bestdeals-y-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B001GCVA0U
Nikkor 50mm f/1.4 G test DOF