Hi Guys! Wondering if someone could help me out. I am shooting a lot of real estate pictures and my Canon 17-40mm f4 L is my goto lens on my Canon 6D body. I'm happy with the quality of the lens, but I'm running into problems when I shoot in very high contrast environments, especially when there is a bright window straight in front. Check the attached pictures, there is a lot of bleed from the overexposed window onto the wall and I'm getting some flair like circles on the images. Looks like the aperture blade doesn't it? The second picture is HDR and you clearly see the round flair spot from the lighter exposure. My question is, should I upgrade to a better lens? 16-35mm 2.8 ii og 16-35mm 4 IS ? Will any of these lenses preform any better in situations like this? Thanks for any advice!