prasad_apte

<p>In your situation, I will get less used 5D III ( since 5DIV is out, there are lot of 5DIII for sale)<br> For 16-35, I will stick to f/4 version coz it is newer lens with latest technology and better performance in corners compared to f/2.8. I will say please go through comparison of 16-35 f/2.8 and f/4. and since you are going to shoot estates and all, I assume that you wont be needing f/2.8 much.</p>

<p>Hi James<br /> I used Sigma for 6 years which was mine. 10-18 belongs to my firend, which I used couple of times myself plus we compare whatever we shot together on outings. That's when I noticed that it is not that great and my 10-18 owner friend also agrees with me <br /> I only parted with Sigma when I shifted to full frame.<br /> Prasad</p>

<p>Go for Sigma, it is surely better that canon 10-18.<br> I have used both btw... and was using sigma for more than 6 years without a complaint.<br> It survived even a fall on rock also. So in both the aspects, image quality and built Sigma is better.<br> btw you can you can read about tokina 11-16 also before making decision. It is a good lens if you are looking for faster lens.<br> Not really useful for landscape but will be helpful in low for other purposes (if you have any)</p>