Here is my mini-review:
http://www.pbase.com/terrylovejoy/300mmf28
Note this is the non-DG version (The DG apparently has better coatings that minimise flare/ghosting but are similiar if not the same optically).
Paul, yep starting to get too crowded. I am thinking of selling my 28 f2.8 and 50 f18 actually
because I'm not using them (I use the Sigma 17-70 for those focal lengths, although the primes are sharper).
Terry