hello firstly apologies been away from my photography for over 12 months due to medical problems but can now get back to our hobby. I want to get in some wide angle landscape/group photo,s and have been looking at 10-20 sigma and tokina lenses when I started reading some reviews on the canon 10-18 ef-s stm lens which has thrown me sideways as they are saying this is as good if not better than the canon 10-22 lens which is twice the price, so people any of you got this lens, it is not a fast lens 4-5/5-6 but only a couple of stops over the opposition so I ould be grateful for any feedback.