The 905 is alot more forgiving than the K, its has a larger head and bigger sweetspot so you've got a little room for error.
The 905 compared to the E, the E looks tiny compared to the 905. Again alot more forgiving, but if you're not a fan of the large CC (410) then you wont be a fan of the 905!
Performance wise i have only found a little more distance and a bit more room for error. Otherwise looks at set up and dynamics are pretty much the same, thats how titleist just are!!
I'll get some pics on soon, probs with camera at the moment.
Plus getting the shaft sorted in the 905 is a nightmare, cause the head is a different weight to the K/E. I must of tried a dozen different shafts when i was being fit for it, just to find one that i liked.
I think the stock shaft Titleist will do when it comes out will be the NV. Thats by far better than the speeder/grafalloy.