I believe in karma, and the material society's golden rule (He with the gold makes the rules).
I like to think that anybody who has bought something from me would do it again without hesitation. Repeat business is the best kind of business.
As far as apertures go, f1.2 is my largest, and the 3 others are all f2.8's, (at least until I get the 800mm f5.6 hopefully sometime this year).
Like Obiwan would say, May the (buying) Force be with you.
And btw, the cf/1.0, cf/1.4, etc... aren't talking about apertures. It's basically a scale of comparing used equipment sellers against the golden (since you believe in the golden rule) benchmark, you. So a seller with a rating of cf/1.4, is twice as likely to use his 1Ds Mark 3 more than you, and probably dare I say, take it outdoors under those trying weather conditions of Singapore.
Most mere mortals out there would be in the excess of cf/2.8 (using it frequently outdoors), with pros being about cf/5.6 (using the camera at times for self-defense).
Yes, it's a Saturday morning, and it seems we're having some free time on our hands.