If your budget is a hard $4k, and you get the 24-70 L (I or II), your choices will be limited on the wide end and long end. An aperture of f/2.8 isn't optimal for low light (but decent with high ISO). Most of the great low-light primes are in the 24-85mm focal range. So there's a big opportunity cost of getting a 24-70mm, if you are on a tight budget.
If you get the 24-70mm L II -- and if f/2.8 is good enough for your low-light shooting -- then up your budget and get the "zooms trinity", as others have suggested (or wait until you can afford it).
But, if you have a hard $4k budget and want a good prime, I will suggest some alternatives.
WIDE: The EF 16-35mm L is a solid choice. It's IQ/sharpness is not as good as the 14/17/24 Ls, but it's cheaper and has a big range.
MID: You have several choices under $1000: EF 50mm f/1.4, Sigma 35mm f/1.4, Sigma 50mm f/1.4. And there's also the 50mm L, which is a bit more expensive and sometimes tough to master.
LONG: If you need range above 70mm, then I feel like it's mostly a choice between Mark I or Mark II of the 70-200mm f/2.8 L series. If you can do without a zoom range (and 200mm reach), the EF 135mm f/2 is probably Canon's best value lens and has stellar IQ.
Here are two alternatives to the zooms trinity:
EF 16-35mm L ($1429)
EF 50mm L ($1400)
EF 70-200m L f/2.8 I ($1400)
OR
EF 16-35mm L ($1429)
EF 50mm f/1.4 ($400)
EF 70-200m L f/2.8 II ($2400)
If you get the 24-70mm L II -- and if f/2.8 is good enough for your low-light shooting -- then up your budget and get the "zooms trinity", as others have suggested (or wait until you can afford it).
But, if you have a hard $4k budget and want a good prime, I will suggest some alternatives.
WIDE: The EF 16-35mm L is a solid choice. It's IQ/sharpness is not as good as the 14/17/24 Ls, but it's cheaper and has a big range.
MID: You have several choices under $1000: EF 50mm f/1.4, Sigma 35mm f/1.4, Sigma 50mm f/1.4. And there's also the 50mm L, which is a bit more expensive and sometimes tough to master.
LONG: If you need range above 70mm, then I feel like it's mostly a choice between Mark I or Mark II of the 70-200mm f/2.8 L series. If you can do without a zoom range (and 200mm reach), the EF 135mm f/2 is probably Canon's best value lens and has stellar IQ.
Here are two alternatives to the zooms trinity:
EF 16-35mm L ($1429)
EF 50mm L ($1400)
EF 70-200m L f/2.8 I ($1400)
OR
EF 16-35mm L ($1429)
EF 50mm f/1.4 ($400)
EF 70-200m L f/2.8 II ($2400)
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