Simple Question: How much wider is it?
I’ve tried to find comparisions like this but feel that most articles are too heavy on technicalities. I tend to get easily bored so here’s actual samples using same settings and same camera position. Let’s go to the shots and pass on the backstory until afterwards.
35mm Sigma Art/Nikkor 20mm on a Nikon D800:


100% crops:


Turning around in the church I did the same tests, this time being just 4-5 meters from the door


100% Crops:


Hell, I even managed to get a shot that I liked :

Ok now for the boring backstory.
I am going to Tokyo next week and since it is supposedly pretty crowded and narrow I thought that my usual 35mm and 70-200 setup wouldn’t cut it. I am planning to use it on both the Nikon D800 and the D500 (which handles superior IMO).
I am a fan of short and concise information and although I appreciate getting into the nifty details I prefer so after getting the general overview.
Many thanks to the great people of DPreview forums guiding me to buy this lens.
And a final comparision

Thank you for the comparison. The most striking difference a part from field of view is the changing of proportions that is really exaggerated by the 20mm prime lens making nearer subjects swell a lot. I think that in many situations a 35mm prime lens or a 28mm prime lens would be preferable, paired with a good 70-300mm zoom. I use my Nikkor 20mm f1.8 mainly outdoor and for star photography. Travelling cities I prefer 24-70mm + 70-300mm or 35mm prime + 70-300mm. Best regards.
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Thank you for this. Very helpful as I’m considering which lens to add to my starters collection for indoor photography.
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You are welcome, glad to help out 🙂
All in all the 20mm is a marvellous lens.
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