Camera Bodies
1) You will get a bit sharper images from the better sensor IF your technique is good--otherwise won't make a noticeable difference for the type of shots you have posted.
2) The major advantages of a wider aperture lens are a) Shooting in dimmer light. b) Ability to throw backgrounds more out of focus.
3) There are techniques in Photoshop (and even Photoshop Elements), with or without extra plug-ins from non-Adobecompanies, that let you quite satisfactorily mimic selective focus.
4) Adding--and using!--a tripod will make more difference to your sharpness than a new camera body. Watch the pros shoot.
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