I added readings to the chart for the Epson 7800 so you can see them side by side with the R3000. As you can tell, there are a few significant differences between the two printers at 100%, but at 25% not so much. In the table the top row of density values is for the 7800, the bottom row the R3000.
Sandy
Measurement of UV densities with Gretag D200-II
Center Bandwith 373 nm
Ink Pattern Page - Printed Calibration Mode
Pictorico Premium OHP
Base density of substrate subtracted from readings
Epson Ultrachrome K3
7800
R3000
25%
50%
75%
100%
Cyan
.71
.81
1.33
1.27
1.74
1.69
2.02
1.97
Magenta
.27
.26
.47
.39
.64
.57
.72
.69
Yellow
.76
.75
1.51
1.22
2.1
1.74
2.63
2.16
Photo Black
.74
.73
1.48
1.25
2.13
1.88
2.7
2.34
Light Cyan
.32
.35
.55
.53
.76
.74
.89
.89
Light Magenta
.11
.11
.16
.18
.25
.24
.30
.30
Light Black
.45
.45
.84
.73
1.20
1.07
1.50
1.35
Light Light Black
.19
.20
.33
.31
.46
.43
.56
.53