I am all new to photography and about 3 weeks ago, I bought a Canon 7D Mark II body.

Up to now, I have been using a Canon 18-135 STM lens, which I borrowed from my friend.

I am thinking about buying a lens now, and since I mostly take nature photos, I am thinking about buying a wide/normal angel prime lens.

So here are my criteria for the lens:

 - I need sharp images
 - It should be wide, since I take photos of large scenes
 - I take pictures at night or low light too

So, I really need your suggestions.

And here is what I came up with:

 - Canon EF 50mm f1.8 II
 - Canon EF 50mm f1.8 STM
 - Canon EF-S 24mm f2.8 STM
 - Canon EF 40mm f2.8 STM

The fact that my camera has a crop factor of 1.6 pushes me more toward the latter two ones.