Upload & Sell: On
I use an EF 70-200 4L IS USM as a walk around very frequently on my 5D2. It's actually a small lens and only a wee bit longer than my 24-105L, but a lot smaller in diameter. The 24-105 is 670g whereas the 70-200 is 760g, so I can barely feel the difference in weight. My 70-200 is not white but, instead, is somewhere between light gray and off-white. I often shoot in dense urban locations--Honolulu waterfront and harbor--and nobody gives me a second look and it is certainly not more conspicuous than my 24-105 with hood.
Noted, which is why I typed what I did - you're apparently one of those photographers Also, I realize the f/4 is lighter/smaller than the 2.8, which may or may not be the version specified by the OP?
I would also venture to say it really depends on where you're shooting as to whether a certain combo looks conspicuous.
Take for instance your location vs mine. You're in dense, urban Honolulu -- generally thought of as a touristy area on the whole and certainly one having plenty of photographers. Meaning, more than likely, the people are accustomed to see white (or light grey or off-white or whatever color one choose to call) Canon lenses.
Now consider where I currently live - Shreveport, LA. Yes, there are a lot of movies shot here, and while we're not exactly a 3rd-world type of location, seeing a large camera and white lens walk around is extremely attention-getting. When I shot with my DSLR / 70-200 combo, people made it a point to move out of my way all the time because they thought I was either on a pro shoot or with the news...then they'd start looking for what I could have been possibly interested in with such a huge rig, etc. etc. etc. etc. etc.
Edited on Jan 03, 2013 at 04:00 AM · View previous versions