It depends on the situation. I will discard cases where I get a backpack that can contain 1 or 2 bodies with several lenses and I will focus (pan intended 8) ) on my small (and now discontinued) Think Tank Urban disguise 30.
Day Shooting with portrait potential: 5D3 + 24-70 2.8II plus 85 1.2LII
Day/Night Shooting (only for portraits): 5D3 + 85 1.2LII (to make it lighter)
Day Shooting general purpose/travel: 5D3 + 24-70 2.8II L plus 70-200 4 L IS (it is difficult and not practical to put a 2.8 zoom instead, plus it will make the bag very heavy hence the f/4 version). In practice a small 3rd lens can fit. If astrophotograpy is possible I will add a 14mm 2.8LII.
Night Shooting (portraits, surroundings): 5D3 with 35mm 1.4L plus 85 1.2LII
Museums: 5D3 + 16-35 4L IS plus 100mm 2.8L Macro
This bag is both small and discrete. You can go in several places carrying it.
+1 to whatever you have in your bag, more specifically what you can afford. I suffer from GAS as bad as anybody, but people need to create "the ultimate gear bag" organically when they can afford it, or simply when current equipment hinders their requirements.
That being said, I recently upgraded to 5d3+24-105L which I have gotten about 8000 shots out of since September and love what I am getting out of it. That is my go to for now with a 50 1.4 thrown in for low light. Rented 70-200 2.8 II and loved the compression and sharpness I got in daylight, but in low light it wasn't everything i expected so that will stay out of the kit for now.
If I am doing fast action sports I still stick with my t4i and 55-250 kit lens. People can harp on kit lenses all they want, but my 55-250 copy I have is more than adequate and I have equivalent reach of 400mm on FF which would constitute a significant expense for my budget. If I made more money off of it I would upgrade, but wouldn't we all...
Mine is my 60D with the 17-55, 70-200 2.8, 10-22, and 60 macro along with a 430exii aand 270ex speedlight in a canon backpack. That will cover anything I want to shoot and the backpack was cheap in comparison to other bags. If I want lighter, I remove the products I know I won't use. Sometimes I rotate in a 50 1.8 or 85 1.8, or my 5D minus the ef-s lenses.
For walking around, mine is the 7d2 with the 24mm f2.8 pancake. For portraits, I put the 70-200mm f4L IS on the 7d2. For video I use the samyang 35mm cine lens on it.
My 5D3 with 24-105L, 16-35 F2.8 + a 580 flash.
These are always in my bag, then my optional lenses, depending on what I'm doing like a 100-400, 100 macro etc.
5D3 with a TS-E 90mm f/2.8 Tilt & Shift. I don't have a camera bag, or a vest When I need to transport a camera or lens I'll wrap it in a sweatshirt and put it in a canvas shopping bag. Thieves are looking for Black Canvas Domke Camera Bags (as used by Henery White ) or Pelican cases, so they never even see my low profile green shopping bag
BTW my walk-around camera is an iPhone, and I carry it in my pocket.
I spent 10 years buying and selling and trying lenses and the three I have now is just right for me, and impossible to choose only one of the three lenses. Perhaps a slight edge to the 50 Art IF it had AF that worked.
I have a 60d in a holster bag with a Sigma 18-50 f2.8. It's not my favourite combo but probably my most used.
If I'm having fun with my camera it's my go to kit and I know that everything else being good, the Sigma will render it well. It's flexible, bright and sharp.
If I'm doing something more sporty and my better half has allowed me to bring more kit then I absolutely love my 7D + 100mm f2.0. Especially for anything moving.
Olympus OM-10 and Zuiko 50/1.4, though for practical purposes I more often use the 6D and 50 macro.
Runners up spot goes to the 6D and 70-300L. The modern tech of IS and flexible ISO really makes s difference at longer focal length. Both lens and camera have excellent build and performance.
This really shows a need to update their range of 50s.
I have four camera bags which I pack differently for various assignments, but anyway, here is my list of favorite lenses on the Canon DSLR formats with photographic genres in parenthesis:
Full frame:
1) EF 135mm f/2 L USM (Sports/Portraits/Concerts)
2) EF 35mm f/1.4 L USM (Portraits/Concerts/Low-Light)
3) TS-E 24mm f/3.5 L II (Landscape/Architecture)
4) 24mm f/1.4 L II USM (Astrophotography/Landscape)
5) EF 40mm f/2.8 STM (Lightweight travel option)
APS-C
1) 24mm f/1.4 L II USM (Studio)
2) 24mm f/2.8 STM (Lightweight travel)
3) 35mm f/1.4 L USM (General + Low-light)
4) 100mm f/2.8 macro (Macro)
5) 50mm f/1.4 L USM (Portrait + Low-light)
70D w/ EFS 10-22mm USM.. Coz I usually shoot landscapes, and then I can just dial in the 22mm for a 35mm equivalent if I want a wider walkaround.
There's the EF 35mm f2 IS in the bag too, but its not my favorite, not yet.