What Lens should I get? Canon 24-70 zoom or Rokinon Primes

It usually all depends on the job you have at hand but the next set of lenses I am going to get is the two matching Sigma Art series zoom lenses. The 18-35 f1.8 and the 50-100 f1.8 These two lenses are amazingly sharp and cover the range of the most used focal lengths..