Ha figures you like that. I didn't want to say anything but all your nikon talk makes me wonder if I went down the wrong path with the Canon. Probably 6 months away from getting a better body so lots of time to change my mind.
The majority of the Nikon talk is just me stating my personal preferences for Nikon's design ethos and product design over that of Canon over the past 31 years...I currently own a smallish Canon system (two bodies, eight lenses) that I payed about $10,000 for in 2006 I guess it was...and at that time, I had to PAY EXTRA for lens hoods for a 50mm f/1.4,85mm f/1.8, and 135mm f/2-L, and none came with a case of any kind. Cases are DIRT CHEAP to make, and to buy at wholesale...they are in FACT, along with filters, the two single highest-markup items sold at most photo retail stores. I bought all three primes on one day, and NONE of them came with a lens hood. Pretty effin lame...especially considering the high price for the items.
And here you are, talking up Sigma, which gave you a case and a lens hood, and thinking you might not want to buy any more Canon lenses....
Seems like Canon's LONG-TIME strategy of undercutting other makers on price by selling a hugely (obscenely, really) marked-up lens case and an inflated-price lens hood separately might have given Sigma a tip on how not to ream its customers. It's also a statement that the company itself does not care enough about customers having the best-possible image quality by not including a lens hood with each lens made and sold. A proper, well-fitted, well-designed lens hood is perhaps the single biggest way to improve image quality, after a tripod.