Man, after reading all of this I'm sort of bummed I don't have a bug behind the front element of any of my lenses. Maybe I should dump my Canon (and Tamron) junk and pick up some Sigmas. Sure, sure it has a red ring.... well BIG freaking deal! Now a bug. Now that's class. Now you're talking. That's style. That's pizzazz. If that doesn't speak of luxury then nothing does. You know when people talk about things having a special magical je ne sais quoi? Well, I do know what. And it's having a bug behind my front element.
And for the techies out there: Who cares about fluorite elements when you can have a bug in the optical pathway? I bet the longitudinal CA performance of his lens is at a near unheard of level. Forget APO designs those are so 20th century. What you really want are BBFE designs.
About what about my precious Zeiss! Does it have bugs behind its front element? Does it? ANY? Not a one?! Enough is enough! I have had it without these monkey fighting bugs inside this MF lens!