We have leather sofas, and whilst I wanted fabric, I compromised on that and my husband compromised on the colour. They are absolutely not hot or cold at all, and I have never had to unpeel myself from them or stuck to them ?.
The store had different grades of leather, so that may have something to do with it - I think the bonded leather ones have a layer of PVC stretched over them, so they may be sweaty/sticky? I know a friend of mine had one of those and the coating cracked, exposing the fabric underneath.
I would honestly have preferred fabric, but the leather is so easy to keep clean, and shows no signs of wear after 5 years or so. The only thing that would be more difficult to remove than from fabric would be biro ink, so I am very careful about that. Otherwise they are very low maintenance.