I use 5D3 ...
I already have the 16-35II, 14L II, 24-105, Sigma 35 1.4, 100L Macro, 85L II 135L, 70-200 f2.8 II and f4 I.S. .....
and tried the 24-70 II ... returned it for softness at 70mm....but may get it back....... yes too much...I love them all
so what would I take to Paris / London ?
my general plan was to make up THE most able and smallest kit for travel and/or home (I have too much gear)
the FIRST PLAN - WAS - to have the 24-70 II ... THEN add the 135 f2 ....small and capable
and THEN add the 14L II ..... get the WHOLE bridge in the shot
but then I tried the sigma 35 1.4 - wow....gotta have it on every trip now...
FIRST - I would NOT go to Paris without an ultrawide - for bridges, buildings, even museums - end of story...
SECOND - for night or weak light
one needs a low-light walkaround that WORKS - the sigma 35 is PERFECT ... cafes, portions of lighted bridges, nicely framed day scenes
then a bit of low light 'reach' - the 135 (1a 1.4x TC still yields f2.
so for ME...I would take the following ...adding EACH new lens ... as I accepted more space/weight requirements
first - if ONLY one lens
- the 24-105 is it... in a small single case ...and 3 batteries and a 3-4 VERY large cards or offload laptop ability.
if ONLY two lenses ..... 16-35 II and the 135L (for me I would cheat and take 50 1.8 ).... for you... take the 50 1.4
(so you already have the Paris kit)
if ONLY three lenses the 14L II(or 16-35), sigma 35 and 135L - that set is crazy good quality...very good low-light
if a FORTH lens is ok, THEN GET THE 24-70 II (and no 16-35 - stay with 14L II) ....
.........so at this point you have 14L II 35 sigma 135L AND a walk-around zoom - 24-70 .... all world-class optics
a 4 lens kit should do it ...add a 25mm tube and a tamron 1.4x sp pro
(a tamron 1.4x on the 135 L gains a little reach - with very little loss in quality or speed)
I cant see 70-200 (f2.8 OR f4) as a travel lens in cities
my conclusion for you is - you have 16-35 and 50mm and 135L
this will do almost everything.... just use them....
I would swap the 50mm for the sigma if any change at all.... the sigma is as good @ 1.4 as the 50 is at f5.6 IMO - a killer
you could walk around the city with 16-35 all day ..ultrawide to near normal
I used 10-22(same as 16-35) for 90% shots in Chicago over 3 days
I sometimes go out for long city walks with the 16-35 and a 100mm macro...like street fairs etc.. gets me close and wide... and fast enough
one more thing ... in PARIS especially...
keep your kit VERY CLOSE - I would run a little cable/lock thru the zippers on a back pack or carry in my front...
the little teenaged thieves are very clever and work in pairs in Paris... they partly unzipped our back pack TWICE at train station entrances ....EVEN when we knew they were there...
SMALLER KIT is BETTER
just my thoughts