I have the newer Nikon 80-400 and have used it for travel a number of times. My second lens has always been the Nikon 24-70 and between the two I can cover all the key range. The 80-400 lens' image quality is very very good in comparison to the Sigma in my opinion. If you are looking to do any nature shots (birds, etc.) I think you would be happier with this lens than the Sigma