I keep hearing about lenses being fast because of being an f 1.2 or 1.4. I have purchased a 2.8 and a 1.8 and to me 1.2 and 1.4 make no sense to me. When I see pictures taken at those numbers the part at the lense is clear then the rest goes out of focus without. To me you should have some transition. Example: A picture of a cat I saw taken at 1.8 had a clear face and the cat was sitting pretty. The body and the background are just as blurry as can be. I would rather see a transition or at least the face and body in focus and the background out of focus. I have to crank down to f3 for starters and f11 on the other end and rarely 1.8 unless I am at infinity. I keep being told I should have went with the 1.4 that is way more expensive so I would be pay way more for a lense I would crank down anyway. 1.4 is only faster if you use 1.4. I almost never would. What I have figured is that if you have to crank down the f stop anyway then would a wider filter size be a faster lense since the wider lense lets in more light and allowing you to make shutter speeds faster. If you can crank the shutter speed faster with a lower f stop and wider lense then why does f stop have anything to do with speed? The wider the f stop the less is in focus. Wider lense makes more sense to me as far a speed goes. Am I not understandin somthing about this? Because at this point lower f stops than f 2 seem like money in the garbage to me. Help me out on this one.