Sharpness Found a Solution

Below is the message that decapix from LYN said to me.

the first one which i wouldn't call it crap
rather equipment limitation
at 144 mm, you should be using 1/250 shutter speed!
unless you have steady hands la
super zoom lens are not meant to have superior optics.
it's more of convenient usage during traveling.
under good light it should perform well
go outside during daylight and shoot.
want it to be sharper? try stopping down to f8

Thanks decapix, i owe you again,
below is the picture taken by Sigma DC 18 - 200 non OS

ISO 400
F8
Direct Sun
focal point at 144mm
expo : 1/640

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ISO 400
F8
Direct Sun
focal point at 200mm
expo : 1/2000

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ISO 400
F8
Direct Sun
focal point at 48mm
expo : 1/1600