I've also tested the differences with 50mm via different lenses. You can see my three lenses in my sig, only the 18-70mm was a kit lens. The quality went how you are probably already thinking. The best was the 50mm 1.4, followed by the 24-120mm, and the kit lens rounding out the bottom. I haven't compared my 1.4 to a 1.8, but I went for the 1.4 because I wanted the fastest AF lens Nikon made. Will I see it, feel it in the field?...who knows. I guess I would have to have both the 1.4 and a 1.8 with me at the next concert, but I can rest my mind knowing it doesn't get any faster than what I have (for AF Nikon at least).
As far as the original poster mentioning the bathtub shots, funny indeed. I always have to put on my least favorite lens, the kit lens, when taking bathtub shots for the same reasons mentioned. I need the 18mm (27mm actual) to get the full tub. However, I'd still rather have my 50mm (75mm actual) vs. a 35mm. I know the eye is roughly a 45mm, but the 50/75mm I get with the 1.4 just seems much more natural to me when using. Who knows, maybe I have freakish eyes and see 65mm...because that's what it seems like.
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Ryan
Nikon D70, Nikon D200, Nikon S8000, & Nikon F100
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