Javascript es6 class extends vs function inheritance

When i printed a “new” function instance before es6 i saw that it contains some values and in the proto i saw some other inherited values and so on in the prototype chain. But when i print a “new” class instance (es6) i see everything in that object as if it didn’t get it from any other object. and even if i delete the proto instance.__proto__=null it still contains all the inherited values. Is the any difference between the inheritance type of them?