...but so many obsess about sharp corners...
Yes, you've hit the nail in the head here. You obviously haven't been made aware of the rules, as excerpted below:
1. All lenses must be sharp all the way into the corners. At all apertures. At all distances. Possession of any lens not meeting these criteria is considered an affront to all photography - you've been warned.
2. You must shoot brick walls or test charts on a regular basis, or your lens will become unsharp, and thus unable to make photos.
3. Correct internet posting protocol dictates that 100% crops must accompany any images you post on the internet. All posting is to be restricted to technical/ camera forums only.
4. You must upgrade your camera body every 12- 15 months. Possession of a camera body that has been superseded, or that fails to meet the requisite amount of megapixels, will cease to take photos suddenly and abruptly.
5. Lenses are to be at least 6 inches long, 77mm filter threads minimum, at least 2 lbs in weight, and at least f2.8. Scratch that - only shooting with professional quality zoom lenses is permitted. Only exception is superfast exotic telephotos. Don't get cute by even mentioning off-brand lenses.
7. You must have no gaps in focal length coverage from 12mm to 400mm.
6. You must carry all your gear with you at all times, including laptop and tripod.
7. If you have not yet photographed a wedding, you must do so with all haste, lest your gear crumble, and you face ridicule by all your internet photo forum acquaintances.
8. Only permitted photographic subjects: flowers, pets, young children. Permitted exceptions: are weddings, as per rule 7.
There are more, but since losing all sanity, breaking most of the above and shooting inferior film cameras, my brain has turned to sawdust.
😉
