Does my lens have a focus problem?

Something doesn't seem to be quite right with the focus of my new 70-200 f/4IS & I can't seem to put my finger on it. Does it appear to backfocus in the following pic? Exif: ISO 100, 200mm, f/4, 1/160, IS On

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Try taking a photo of a street sign or something flat and post up a high-res version.
Is it just this one picture or all your images? My 70-200 seems to be front focussing ever so slightly so I'll be sending it back to Canon for calibration.

Is it just in this one shot, or are you seeing it in all of your shots?

This was my first day of shooting with the lens and the best example I could find where it was most obvious. I'll look for some others to post.

Double post

If you didn't use a tripod for this shot it's useless to test against it. You move, flowers move.

Pick something immobile and use a tripod.

For shots like you posted, you can't shoot with razor thin DOF and expect good results. I'm guilty of it alll the time. Shooting too wide open to get usable DOF. Bump the ISO and stop 'er down a bit in real world.

But back to the test, use a tripod...

Here's another ISO 400, 200mm, f/4, 1/1250

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Second one looks okay.
Like cosworth said: thin DoF, so if you use OneShot AF *make certain* you (and the subject) don't move after focus lock...

the bird shot looks perfect
you've had the lens one day!
take lots of shots at different apertures over different days.
then come back.

Thanks for the comments. FYI I was using AI Servo & * button for focus, so I thought the camera would continually refocus and track the object if it moved slightly.

Within limits, yes.
Camera has to notice you moved though

Well I took everyones advise and took some more shots. Thank you. Here are the last ones (I promise !). I think they look better. Starting to love this lens.
All handheld, IS On, no PP, just resized.

ISO 800, 200MM, f/5.0, 1/200

Look pretty darn sharp to me, on all of them. Sure a thing dof is a b*tch to nail handheld.Like others have said use a tripod of you want to test sharpness.

It looks as if there is some pixel-peeping going on here, especially on that helicopter.

they all look fine to me. i think you definitly overanalaysed the first shot. the flower, you, or the camera could have moved ever so slightly and caused that, all the rest are spot on.

You are absolutly being paranoid. Nothing wrong here except you sensor is really dirty.