Im in a bit of a panic honestly. I have a job shooting a new yoga studio interior next Friday here in Chicago and I just realized my current setup is totally failing me. Ive been using the 24-105mm on my S5II but even at 24mm the rooms look tiny and cramped and its just not giving that professional architectural feel the client wants. I spent way too much on the camera body and now my bank account is looking pretty sad so I need something wide but cheap.

Ive spent the last three hours looking at reviews and Im just more confused now. I keep seeing the Sigma 16-28mm f2.8 mentioned as the go-to but its nearly a grand brand new and I just cant swing that right now. Then theres the Lumix 20-60mm kit lens which is super cheap used on eBay, but is f3.5-5.6 actually going to hold up indoors? The studio has decent natural light but Im worried about the corners being soft or it just looking like a kit lens photo if that makes sense. I also saw the Lumix 18mm f1.8 prime which fits the budget better but I read some people complaining about the distortion correction being digital-only and Im worried about the straight lines on the walls looking like wet noodles.

I need to pull the trigger on something by tomorrow so it gets here in time. Here is what Im looking for:

• Budget: strictly under $600 (willing to go used if I can find it)
• Mount: L-mount obviously
• Usage: interior architecture so I need straight lines
• Speed: fast enough for indoor handheld if I have to
• Wide: definitely wider than 24mm

Are there any hidden gems Im missing? Maybe some manual focus Chinese lenses like Laowa or something? I dont mind manual if the glass is sharp enough but Ive never used them on the L-mount before. Does anyone have experience with the 20-60 vs a dedicated wide prime for professional-ish work? Im desperate...