Life is like that..you can analyse all day long and think of what you need now, but that need may be different when a new situation arise. If life would be that simple, the manufacturer won't need to produce so many different types. Having diversified interest ? Then BBB lor...if you can afford them. I, also asked myself the question, why would anyone want to buy an expensive f1.4 lenses,knowing that the quality may not be sharp at that value ? Well, I did after doing a search on the sites that I will visit. Some memories is better than none, dim light, no tripod, no flash allowed. Sometimes, I wonder what's the rationale of not permitting the usage of tripod when the space itself is ample for movement.