Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
Other reviewers have already covered the many positive attributes of this lens.  I already own an excellent copy of Canon's 70-200 f/2.8 zoom so I was curious to see how the 135 L would compare with a 1.4 TC installed.  The 135 is MUCH sharper and has noticeably better IQ (image quality) from f/2.8 to f/8--so much sharper that I am considering selling the 70-200.  The Zoom is more convenient and still produces great pictures, but I will be more likely to reach for the 135 L plus the 1.4 TC when shooting at 200 mm (135 L + 1.4 TC = 189 mm).  At 135 mm this lens produces absolutely STELLAR results.  I am currently using it on a 40D crop camera so it is a little long for portrait work but I purchased it with an eventual move to Full Frame in mind.  You absolutely cannot go wrong here if you are in the market for this focal length.  Five stars don't seem like enough!!

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive