I received a King C Gillette blade today sent from forum member @Bill_G. I have taken a 200x photo and I am going to post it with other P&G Russian blades for comparison. Unfortunately I don't have any Gillette Platinum, Minora or Permasharp blades.
King C Gillette 200x
Gillette 7 O'Clock Sharp Edge (yellow) 200x
Gillette 7 O'Clock SS (green)
Astra SP 200x
Astra SS 200X
Gillette Rubie 200X
Gillette Nacet 200x
Gillette Silver Blue 200x
Polsilver SI 200x
Wizamet SI 200x
King C Gillette 200x
Gillette 7 O'Clock Sharp Edge (yellow) 200x
Gillette 7 O'Clock SS (green)
Astra SP 200x
Astra SS 200X
Gillette Rubie 200X
Gillette Nacet 200x
Gillette Silver Blue 200x
Polsilver SI 200x
Wizamet SI 200x