How do I determine the optimal size for a corner bathroom sink?

What would be the best size corner sink for a 5x7 ft full bathroom to help pick up space?

Any suggestions as to where or what model to purchase?

Already bought a non returnable that just looked way too small for the space so any advice would be much appreciated.

Sink and base cabinet has to be according to code–18" from Center of Water Closet to cabinet / tub…Space is in the calculation of a bathroom, make sure your cabinet is code compliant.

Where and model----It depends…You can get it new, or slightly used, sometimes, cancelled or change ordered-----material purchase depends, on craigslist, I’ve picked up materials for 1/3 price in near mint condition, some clients gladly accept, others want new, you might call around for dis-continued, discounted, slightly damaged ( damage after install hidden – no liability or function issues)-----research is best. Some manufactured products are not high sellers, suppliers want to move them asap, and will make deals. A little research could save you hundreds.