I feed my cats wet food...Weruva, Earthborn, Wellness (regular grain free varieties and core), Nature's Variety Instinct, Go!, and Before Grain. They each get one 5.5 ounce can a day (split between two meals). My cats are 9 and 11 pounds, one is a perfect weight, one is a little chunky.
Even if you can't or don't want to feed ALL wet food do try to feed as much as you can, the more the better. Cats are widely affected by dietary problems...obesity, diabetes, UTIs, crystals, stones, kidney disease, etc. many of which could be prevented by feeding lower carb, higher moisture foods. They are not omnivores, so the less veggies, grains, and fruits, the better for their system. Their normal diets would only be like 3% carbohydrate and dry foods are around 30%, even the "good" dry foods. Cats also don't have a strong thirst drive...they don't tend to drink when they're hot or have been playing like people or dogs would. They have to be rather dehydrated to feel the urge to drink (although some are stimulated to drink by running water). So their urine is concentrated which damages the urinary system and the dehydration takes it's toll on their body over time.
When I fed dry food only they each ate about 1/2 cup a day if I remember correctly.