In reality... what you like best is what is best.
I tried all the "legendary" lenses.
The 135L - Owned it. Was too long to be useful often, relegated to a specialty lens, also required 1/200 shutter speed for me to be able to get sharp images frequently, which was sometimes hard to achieve and resulted in higher ISOs.
The 70-200 II - Rented a dozen times for weddings. Was wonderful, took very sharp, contrasty images, but they lacked the "3d" "magic" look of the 135L and 85L. Also very very expensive and heavy.
The 85L II - Rented a dozen+ times for portraits/weddings. Was incredible, very sharp, "3d" "magical" photos @ 1.2 and 1.4, but so very expensive and the autofocus was too slow to capture some of my faster-moving subjects.
The 35L - Owned it. For one, it wasn't as sharp as my 35 f2($250 lens) @ f2 in the center, and was only a little sharper in the corners. My 35 f2 was equally sharp all over from f2.8 and up. It was also a little too "dreamy"(soft) for my tastes at f1.4.
I ended up with the sigma 85 as my main portrait lens because I loved how sharp it was at f1.4, I loved the look of the background bokeh and the fast autofocus and the $1000 cheaper than 85L II price!
I ended up with the sigma 70-200 OS as my portrait/event zoom because it looks great at 200mm f2.8 and has very nice image stabilization and an excellent price.
I ended up with the sigma 35 as my wide angle low light lens because it's significantly sharper than the 35L, cheaper, I prefer the bokeh, and it's a focal length that I enjoy and think pairs perfectly with the 85.
My point is that I had to go through a dozen of the "best" recommended lenses before I found:
A.) The subject you most enjoy taking photos of, portraits for me.
B.) The focal lengths that I most enjoy: 35mm, 85mm, 200mm, and ultra-super-wide 14mm.
C.) The "look" you like to get from your photos(how big does that aperture need to get?)
D.) How much are you willing to spend?
Once you know those things you can really get a final lens setup.
If I were you, I would rent a couple really nice lenses like a 24-70 mk ii and a 70-200 mk ii and shoot with them like crazy for a week, then look back at your photos and see what focal lengths you used most frequently, THEN buy what you'll really stick with rather than going through a ton of lenses like I did.