Has anyone here used both the 20mm Nikon 2.8 and the 20mm Sigma 1.8?\nI'd be keen to hear your opinions. I've been thinking about getting a\nwide angle lens and these two seem to be within my budget. I don't\nshoot a whole lot of photos, but most of what I take are landscapes. I\ndon't think I'd personally notice a big difference in quality (build or\noptical) between them but then I'm not really an expert. The Sigma is a\nbit faster which is nice, but my other lens is 62mm so I could use the\nsame filters.