Quote: Ivor K Hicks: The average review score of the Tammy is not a fair score for this lens. Most of the reviews gave it a 9 or 10 rating. It's average score was appreciably lowered by one reviewer who bought one second hand, got the sticky aperture problem and only rated the lens as a 3.
I think the lens is rated about 9 - 9.5 in my opinion. If and when i write a review i would give it a 10 just to counteract that very poor and undeserved rating of 3.
Yes, the mean is unduly affected by very high or very low scores, which is why many rating systems throw out the high and low. It is not fair one person can do so much damage to a lens' reputation by putting a ridiculously low score. However, if you peruse the database you will see this is a common thing, especially in the 3rd-party ratings.
I only showed the scores to show the 2 lenses are probably comparable. Statistically speaking, the difference in scores in our database is not significant because of the small sampling size and because there is no way to know that each review is actually a real one ie., based on an actual owner's experience with the lens in question.
Bottom Line: I agree with you--my only reason for posting was Yusuf's opinion that the 2 lenses are "not in the same league."