Sigma vs Canon

My current optics are Canon 24-105/4 IS and Sigma 100-300/4.
I was wondering to change that. To sell Sigma and to buy Canon 70-200/4 IS.
I see that this lens beats Canon 70-200/2.8 with/without IS version in
optical quality. Is this visible in normal use?
I mean, 2 is bigger than 1, on a paper. But in real life, can someone tell
the differnce?
Sigma has -300mm range. Canon -200mm. But Canon has IS. Maybe, someday in
the future I will buy Canon 300/4 IS. Maybe. But leave that now on the side.

Is Canon better than Sigma? How much?
Now I have range from 24-300, perfect. In other case, I will have 24-105 and
70-200. Overlap (70-105) is not such a problem. But than again, I would buy
a lens which is only 100mm more than 24-105.
Hm. And to buy extra 300/4 IS is not so cheap.

I don't need 2.8 because I'm not sport photographer or something. Sometimes
on my ex Sigma 70-200/2.8 I used 2.8 or 3.5, but not so often.

The reason why I am asking you that is because I had KM 7D and it has IS in
the camera body. So, every lens attached to the body was stabilized. And
with IS always on, many times you don't know when IS helped you or not.
IS on Canon lens seems very very attractive.

Any experience with those lens?

Thank you in advance.


Alan


--
"Gravitation cannot be held responsible for people falling in love..."

"Lagonda" <lagonda8 DeleteThis @gmail.com> wrote:

>My current optics are Canon 24-105/4 IS and Sigma 100-300/4.
>I was wondering to change that. To sell Sigma and to buy Canon 70-200/4 IS.
>I see that this lens beats Canon 70-200/2.8 with/without IS version in
>optical quality. Is this visible in normal use?
>I mean, 2 is bigger than 1, on a paper. But in real life, can someone tell
>the differnce?


It is difficult to make an f/2.8 zoom perform as well as an f/4 zoom,
all things being equal. So it is not surprising that the 70-200mm f/4
is a slightly better performer. I doubt that the difference is great;
I am very happy with my f/2.8. But it is heavy and bulky and there
are times when I wish I had the lighter and more compact f/4.


>Is Canon better than Sigma? How much?


Look at the resale values for both lenses. Buy the Canon new and sell
it on eBay as used, but in mint condition, and you will lose very
little money. Buy the Sigma new and sell it on eBay as used, but in
mint condition, and you will lose a much higher percentage of its
original price. You will probably lose more in cash terms too.

That should tell you which lens is the better buy.