Unless otherwise stated, 1 or 2 people will share a 3-4 person tent, with plenty of space for you and your gear. But please note, high-grade tents designed to cope with extreme conditions don’t allow much room to stand up and walk around in your Kilimanjaro tent.
For more space and comfort, you may want to upgrade your climb to have a sleeping tent for you alone so you do not need to share, or a bigger walk-in size tent to share with your travel companion.