Pretty much yeah. The 70-200 series is Canon's best four zoom lenses imo. The IQ difference between each variant isn't much. The f/4IS is the sharpest, of course. But not the most versatile to me because of the slow f/4 aperture. Which is why I went with the 2.8 IS variant.
As for 70-200 f/4IS vs 55-250 IS, the difference is in every aspect of lens making sans focal length. Sharpness, background blur, color, flare resistance, USM, IS, built, weather sealing... and the list goes on.
Every lens is designed for a special audience. For general purpose everyday usage to record your family activities, most people will be happy with the 55-250mm. Since most people here in CS is more than just a causal shooters, they demand higher quality than others.
Which group do you belongs to? Only you will know the answer. Don't be sway by the hard core CS forumers that demand the best of the best.
Which lens to get? this is a question only you can answer. Even if you have the money, if you don't even care about the IQ difference between the two (or can't tell), then why should you be paying more?
I really appreciate all of you giving some good advice. Im the kind that do leisure photography and like taking photos in every part of my life... my family, my job, places i go to.. also i try to learn to take good shot like many people here.
Today, i use my 17-55mm f2.8 to look like photos of my neice playing basketball.. though its nothing compare to the professional, but i find that its good enough for me.
What i realise is that using the better lens can help u to capture the moment better. The normal kit len, 18-55mm is maybe too slow to capture the photos of my niece playing basketball.
So if cost is not a concern, i will go for 70-200mm f/4 IS. I believe it will help me to take better pictures that to me is having a good clear image not blur.