I am upgrading from a Canon 70D with a 10-22 mm lens to a Canon 5D Mark IV. My question to you is which lens you would recommend if money were not an issue? I've read that the 16-35mm F4 L is much better than the 17-40 mm, but is there another level up that I should consider such as the Canon 16-35mm f/2.8. Which would you buy?
You can do a lens quality comparison analysis at DxOMark.com. Here's what the DxOMark scores for the lenses you ask about (higher is better):
If this gear is primarily for real estate photography I would consider the Canon TS-E 17mm f/4L or Canon TS-E 24mm f/3.5 (tilt-shift lenses). Many interiors photographers use these lenses because they designed explicitly for interiors and architecture.
Simon Maxwell says:
I couldn’t operate without the Canon 17mm TSE. The time you save in post not having to straighten verticals soon adds up. Sure, it’s a punchy investment but I am confident it will outlive many of my cameras.