There has been a lot of discussion going on about what are the impacts of using a crop sensor vs full frame when using a particular lens. How are crop factor sensors impacting depth of field and what are they doing to composition. In fact if you went to any photography forum on the web, you are likely to get as many answers as forum members.
Of course, the answer to that question really depend what you are comparing and how you are doing your tests. Photographer Neil van Niekerk did a thorough test accompanied with clear explanations on what actually makes a difference when using a crop sensor vs a full frame and the answer is not that simple.