Thanks all for the useful advice. Paid visit to store last weekend, saw the real Kelly 40, gold color, GHW, and passed.
Weight: not that heavy for a guy. Acceptable weight if you are used to carrying a lot of stuff with you.
Look: a really nice and classic bag. it's just "a little bit" (yeah and just a little bit) large, especially the bottom part relative to my height. I think it may look smaller if it were a black bag
Strap: definitely need to replace with a wide strap, and maybe a longer strap for cross-body (but it may look stupid if using as a cross-body bag)
Conclusion: I told my SA if I were 6ft tall I would definitely take it, so passed.
My SA just can't think of any to suit my style and need to think over again and see what can be an alternative. Will definitely would like to hear from you any suggestions.