To answer the original question: try to find a sporting goods store that carries identical binoculars in both 8x32 and 8x40 or 8x42. You can't mix and match brands/models. Plan on spending some time. Find the darkest areas of the store and carefully compare. Use a tripod for each if you can. Find an object in the store with fine detail. Many shops have test patterns. Also, go when it is dark outside and get permission to compare them outside. Take your time. You will or you will not see a difference. If you don't get the 8x32. If you do, then decide how important that extra light gathering ability is for your type of hunting. If you hunt antelope in the middle of the day, the light gathering boost is meaningless. If you hunt deer and elk in the dark rainy shadows of the Pacific Northwest timber, then it might be worth the extra weight.
