Is there any difference in meaning between the following sentences?

1: I look forward to hearing from you.

2: I'm looking forward to hearing from you.

3: Look forward to hearing from you.

4: Looking forward to hearing from you.

5: Looking forward to hear from you.
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Jackson66121: I look forward to hearing from you. (fine)

2: I'm looking forward to hearing from you. (fine)

3: Look forward to hearing from you. ('I' should be used.)

4: Looking forward to hearing from you. (as above)

5: Looking forward to hear from you. (incorrect)

For the correct sentences, there's no difference in meaning.
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