1. A person who is "perceptive" has the ability to see and understand circumstances. "Perception" refers to the act of seeing and/or processing information in one's mind. 2. A person who is "sensitive" also has the ability to understand circumstances, but is more influenced by their feelings. This is related to the term "senses" which refers to the feelings sight, taste, touch, smell, and hearing. Someone who is "sensitive" may be regarded as one who is easily affected by their emotions as well. In my opinion, "perception" deals more with information, whereas "sensitivity" deals more directly with feelings. However, "perception" and "sensitivity" ARE synonyms and are similar in use. The difference is slight and lies in the context in which they are used. Source: myself, American English

Perceptive refers to you seeing or understanding of things. Sensitive refers to your reaction to things.