In amongst the various reviews, there have been a few comments regarding the size and weight of this new breed of lenses. I am thrilled with my purchase of the Sigma 35/1.4 Art and am also very impressed with their 50/1.4 Art ... and completely blown away by the IQ of the Otus 50/1.4. However, the sheer size and weight of these chunky things really begins to add up in my bag, and I won't be inclined to add another similarly-sized lens anytime soon. Are big and heavy really synonymous with quality? Is this an issue with your current line-up of lenses and will this be a factor in your future purchases?