After much thought about it, I’ve decided to sell my Sigma 18-200mm f/3.5-6.3 DC OS.
Since I bought my other lens, it has been left untouched (and stored in my camera bag and in cupboard) for most of the time. Though I love the idea of having a walkabout lens, the 11x zoom which allows me to take photos of the moon and the versatility, I felt that it is way under-utilised and I rarely use it to its full extend.