While I agree that hybrid lenses (with a plastic aspherical element glued to a standard spherical glass lens) has brought down the price of aspherical lenses -- which is why even the el-cheapo 18-55 DX kit lens has an aspherical front element! -- I don't think modern technology has made large aperture lenses "affordable." It seems size matters. DX lenses with aspherical elements can be made cheaply but pro-grade full frame lenses are a different ball game altogether, i think.
Consider the Canon 50mm f1.2L, or the Leica 50mm f1.4 M, both aspherical designs. These are modern lenses which are in production and you can buy off the shelf (so no collectors' premium here). The Canon 1.2 goes for US$1,600 whereas the smaller Leica lens is US$3,600. If Nikon were to come out with a revised Noct-Nikkor 58mm, I doubt it will be cheaper than the old one...
Incidentally, the Leica 50 f1.4 has the best optical quality I've ever seen in a 50mm lens wide open (BTW, Leica does not use hybrid elements). See the first image in sample shots below (M9 with 50 f1.4) -- simply awesome!
http://www.dpreview.com/gallery/leicam9_preview/
Rgds
Of course, I'll have to agree with the statement. For the best quality, grounded and polished optics are still the way to go but the process is expensive. Nikon has discontinued many of these exotic optics because I believe they only appeal to a small group of people. Nikon did not do very well and could not sustain these exotic optics because they don't make money for them. Their main competition had sufficient consumer products which makes them enough money for them to produce such exotic lenses. Leica is in a totally different ballgame.
Comparing the Nikkor 28/1.4 and the Sigma 24/1.8, it is clear enough that the Nikkor beats the Sigma hands down. Only problem is, you could buy at least 4 copies of the Sigma for the price of the Nikkor.
But if you compare the Sigma to a normal Nikkor in the same price range, the Sigma would beat them instead because of the aspherical elements used, so in that sense, a hybrid aspherical would give advantage over normal spherical optics for the same price. Then comes the question of the 'character' of the lens.
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