....got it,love it..........do you need it?ain't no better in low light than the 18-105.I would really explore the 18-105 further before I laid out $800-900.I still use the 18-105 quite often....especially at shows where cars are packed,but might want a longer focal length while walking around.Last Sat,shooting drags,in good light,both a friend and I chuckled when we both discovered we went to this lens over faster stuff.