I also have the 4p with IS, and must say ...
So the difference is not really crass.
But as I like to enjoy spending Vides of fireworks, and generally at night videos, my extra visor is very welcome!
I see here so with the 70-200 4L IS.
The thick baby has:
At maximum aperture less chromatic aberration, (actually almost no !!!) and significantly less Vignette.
Very little distortion. Backlight is conditioned better the bokeh is just gorgeous.
Cropping is super here, the bokeh is much softer.
Focus is fairly common, a hint of fine and high contrast. Just a touch!
A vulnerability I've found ...
Night Scene: f4 16 makes nearly equal rays, the f2.8 makes 8 double beams.
See light star in the lightweight model so out somehow natural.
Both lenses have 8 diaphragm blades, the result is a matter of taste.
Tip: The Macro 100mm 2.8L IS is a night perfect! just lovely!
Understatement Wrong! It coincides with the "small" model on already,
will you now on behalf of which newspaper you are always in demand here active,
And why ?!
"Grevenbroicher Tachblatt!"
Theme ... weight!
That's using the supplied camera strap the Canon a dramatic experience ...
Teleconverter is wonderful, 1.4x focuses still very fast, sharp images!
Here, the f4er IS is then with f5.6 and sluggish AF a Frohsinn reducer ...
Autofocus as I said especially leg Extendereinsatz much snappier!
Very big plus: The IS is much quieter at work! (Video Friendly)
In this day and age may also be a good investment. (My Opinion)
Is something like lens Gold ...
UPDATE:
Meanwhile, I also use the Canon Extender 2x III to this appearance.
It was only a matter of time, the desire for it comes automatically!
Good results possible, of course, not nearly as sharp as the 1.4x
or without extenders. Color distortion and contrast remain on superbem level.
The autofocus is still surprisingly fast, faster than the 1.4x at f4 IS.
At f4 IS with 2x no AF is possible, "thanks" Canons "policy".
Extender use is probably one reason to buy a 2.8er lens!
So you have benefits here.
It is true, the tripod collar can be done only from when the lens of the camera is disconnected.
Solution: Always turn can, when not in use 90 degree turn upward
and notice. She does not bother to photograph when freehand.
So an extra thread above has advantages. For example, Gorilla Pod Mini dranmachen,
which can hold an LED flashlight. Just an example.
If you need the clamp then, it's there! So do not settle, my opinion.
Greetings from the sunny Rhineland!
All-time good light!
Ingo