Recent threads have observed that the 35 mm lenses are not quite as good as the 28, 50, and other lengths. Are people happy with their 35s? If so, are they 2.8 or 2.0? Single- or multicoated? I admit to being dissatisfied with my single-coated, silvernose 35/2.8 (soft, low contrast) and am wondering if other versions are better. Is there a version of the 35 that's as good as the 28/2.8?