I have also found a source on the internet that say that you can successfully use Cokin X-Pro Series Filters with the Nikon 14-24mm so I guess this filter system could also be adapted to the Sigma 8-16mm with a bit of DIY.
Now I will start to use my new toy in a creative and fun way to capture some great shots, a small gallery of sample images on this page will complete this review and will be posted when they are produced.