Kant: all characteristics of phenomena depend on the observer. The ding an sich thing in itself is hidden. Hegel: a dialectical process reveals even the dinge an sich. [Neo Kantians went wrong thinking existence itself of objects depends on the subject. Dr Kelley Ross goes into this. But Hegel did not because this mistake happened after Hegel.
[This all started with the idea of traits dependent on the subject and essential traits. Kant just noticed all traits depend on the subject.]