An attempt at some empirical process which might be of some use ...
Personally, my top 20 sharpest goes along the lines of ...
BIC Chrome Platinum < if you want something more than the Nacet
Gillette Nacet Stainless < I'd like to put Gillette Rhino as well, but think it's the same blade
Personna Platinum Chrome < super-sharp and super-smooth
Lord Platinum Class < and Racer/ASCO
Permasharp Super
Silver Star Super Stainless
Super Shave X
Gillette Winner Superior Platinum
Gillette Super Thin (Thai) < not Viet, which seems far less sharp
Wilkinson Sword (Germany)
Gillette 7 O'Clock Super Platinum
Euromax Platinum
Shark Platinum < just a tick below the premium Lord brands
Statum Platinum Chrome
Gillette Super Blue & London Bridge < possibly the same blade
Feather Hi-Stainless
Racer/ASCO Super Stainless
Derby Premium
Gillette 7 O'Clock Permasharp Stainless (Green)
BIC Astor < start and finish the list with BIC, eh?
Top 10 in the list are seethingly sharp, the next 10 are very sharp.