I just got my first real camera like a week ago its the Sony A7R something I think the V? anyway I am so incredibly excited because I am finally going on my dream trip to Iceland this September and I want to take those like really crisp professional looking pictures of the waterfalls and the mountains you see on instagram but honestly I am so lost looking at all these lenses. I want the absolute sharpest thing possible because I heard that matters most for landscapes but there are so many options and its kinda overwhelming lol.

So my logic was that a more expensive lens means it's sharper right?? But then I saw some people saying that these prime lenses which dont even zoom are better than the ones that do zoom? That sounds so weird to me why would I want a lens that doesnt zoom but if it makes the mountains look sharper then I guess I should look into it. I have about $1800 saved up just for the lens part and I really dont want to waste it on the wrong thing because this is like a once in a lifetime trip for me.

I was looking at the 16-35mm GM one but then I saw a 20mm one that costs less and people said it was sharper and now my head is spinning. Is the difference actually noticeable to a normal person or am I just overthinking this whole thing? I want my photos to look like you could step right into them. Also someone mentioned diffraction and I have no idea what that even is or if I need to worry about it... sorry if these are really basic questions I just really want to make sure I get the best gear before I get on that plane in a few months. Do I need a zoom or a fixed one for the best quality? Or is there like a specific landscape lens everyone uses that I just havent found yet? I just want the most detail possible so I can maybe print them out big later...