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I don't think you'll need to worry too much about lens distortion from a 24mm lens. Lightroom and Photoshop have tools that completely fix this with minimal loss of content.
+1 for the 17-55 2.8. It does everything the 24mm does and more, minus the size/weight penalty as mentioned.
Donnie Fisher above mentioned that adding light can help. This is massively important in my opinion. If you're getting poor quality images it's likely this is down to a lack of light. Boudoir sets can often be dark too (even the furnishings) which won't help. Adding more light will allow your camera to run a lower ISO setting, resulting in a cleaner image. There are very cheap studio lighting kits on amazon that will get you started.
+1 for the 17-55 2.8. It does everything the 24mm does and more, minus the size/weight penalty as mentioned.
Donnie Fisher above mentioned that adding light can help. This is massively important in my opinion. If you're getting poor quality images it's likely this is down to a lack of light. Boudoir sets can often be dark too (even the furnishings) which won't help. Adding more light will allow your camera to run a lower ISO setting, resulting in a cleaner image. There are very cheap studio lighting kits on amazon that will get you started.