Canon Eos Rebel XTi/400D
Nikon D80

Tamron 90mm 2.8
ISO 100
Sharpness 3/7

Tamron 90mm 2.8
ISO 100
Sharpening Medium +1
Tamron 90mm 2.8
ISO 100
Sharpness 4/7
Tamron 90mm 2.8
ISO 100
Sharpening High +2
Tamron 90mm 2.8
ISO 100
ACR 3.6 beta
 Tamron 90mm 2.8
ISO 100
ACR 3.6 beta
Tamron 90mm 2.8
ISO 200
Tamron 90mm 2.8
ISO 200

Tamron 90mm 2.8
ISO 400
Tamron 90mm 2.8
ISO 400
Tamron 90mm 2.8
ISO 800
Tamron 90mm 2.8
ISO 800

Tamron 90mm 2.8
ISO 1600

Tamron 90mm 2.8
ISO 1600
NR 1
Tamron 90mm 2.8
ISO 1600
NR 0
Tamron 90mm 2.8
ISO 1600
NR 3
Tamron 90mm 2.8
ISO 3200
NR 1
Tamron 90mm 2.8
ISO 100
Tamron 90mm 2.8
ISO 200
Canon 17-55mm IS @17mm
ISO 100
Nikon 18-200mm VR @18mm
ISO 100
Canon 50mm 1.4
ISO 100
 Nikon 50mm 1.8
ISO 100
Canon 50mm 1.4
ISO 100
 Nikon 50mm 1.8
ISO 100
Canon 50mm 1.4
ISO 100
 Nikon 50mm 1.8
ISO 100
Sharpness 1
Canon 50mm 1.4
ISO 100
 Nikon 50mm 1.8
ISO 100
Sharpness 1
Canon 50mm 1.4
ISO 100
 Nikon 50mm 1.8
ISO 100
Canon 50mm 1.4
ISO 800
 Nikon 50mm 1.8
ISO 800
Canon 50mm 1.4
ISO 200
 Nikon 50mm 1.8
ISO 200
Canon 50mm 1.4
ISO 200
 Nikon 50mm 1.8
ISO 200
Canon 50mm 1.4
ISO 200
 Nikon 50mm 1.8
ISO 200
Canon 50mm 1.4
ISO 1600
Sharpness 3
JPEG

Nikon 50mm 1.8
ISO 1600
Sharpening Medium +1
JPEG
Canon 50mm 1.4
ISO 1600

RAW ACR
Sharpening 25%
NR default

Nikon 50mm 1.8
ISO 1600

RAW ACR
Sharpening 25%
NR default

 
Tamron 90mm 2.8
ISO 100
1:1 macro

RAW ACR
Sharpening 50%

Tamron 90mm 2.8
ISO 100
1:1 macro

RAW ACR
Sharpening 50%

Tamron 90mm 2.8
ISO 100
Tamron 90mm 2.8
ISO 100
Canon 50mm 1.4
ISO 100
 Nikon 50mm 1.8
ISO 100
Canon 50mm 1.4
ISO 100
Fill flash
 Nikon 50mm 1.8
ISO 100
Fill flash
Canon 50mm 1.4
ISO 100
SH in Photoshop
Nikon 50mm 1.8
ISO 100
D-lighting in camera
Full review:
Canon Digital Rebel XTi vs. the Nikon D80