Gaps in focal length across 3 lenses and minimum aperture?

Gaps in focal length across 3 lenses and minimum aperture? I currently have a Sigma 24-70 2.8 that isn't quite as sharp as I would like it to be. I have a 50 1.8 and a 70-200 2.8 as well. I'm considering getting a 17-40 f4 to replace the 24-70. Am I likely to miss the 40-49 and 51-69 gaps in focal length? Also, how much will I hate a minimum aperture of f4 after shooting with faster glass for years? I'm...

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