Sigma 20mm F1.8 EX DG Aspherical RF

Wideangle prime lens | Canon EF, Nikon F (FX), Pentax KAF, Sigma SA Bayonet, Sony/Minolta Alpha
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I'm wanting to buy a lens for full frame Nikon at 20mm or slightly wider. I can't justify high expense - £300 absolutely maximum, so that excludes latest Nikon 20mm 1.8 and Sigma Art 1.4. One option is a Sigma 20mm f/1.8 EX DG but I can't work out if there have been a non aspherical and an aspherical version of this lens. Looking at the photograph on one retailer here it doesn't say Aspherical on the lens, like it does on the Photographylife database here But on an eBay listing here it...
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I was considering buying a filter holder and filters for my Samyang 14mm. Which is good but with all it's disadvantages. I saw this 20mm Sigma lens which it has good price and 82mm filter thread. Did anyone tried this lens on a K1? any comments?
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Hi, I'm new to photography and I've recently purchased a sony a5100 with two kit zoom lenses (16-50mm and 55-210mm). I would like to add a fast (not too expensive) prime lens to my set that would be good for indoor low light conditions.  I'd like to compare the sony zeiss 24mm f/1.8 sonnar (e-mount) lens with the Sigma 20mm f/1.8 EX (used with a sony a-mount to e-mount adapter). Price is important to me too so I'm looking at purchasing the Zeiss lens used or the Sigma lens and adapter new so...
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