Tamron 90mm f2.5
This review is mandatory, I suppose. If you are not aware of this lens' legendary status you must be new to this world. Having said that, it's a legend for good reason.
Macro performance is top notch at maximum magnification of 1:2. If you need 1:1 you must use a matched extension tube.
Performance at distance is top notch as well. This lens is a great general purpose lens. It's soft bokeh makes it a first choice for portraiture.
Tack sharp. Yes it is. From 2.5 up it is tack sharp. If you are picky you may see a slight softening in contrast at f2.5.
Fringing and CA is barely noticeable at close inspection. Tamron's BBAR coating is as good as it gets.
ISO 400 - f2.5 - 100% crop
ISO 400 - f8 -
100% crop -10 feet
ISO 400 - f5.6 - 50% crop