In principle, the specifications for both the J1 and V1 sensors are the same, with the sole difference of an anti-dust window on the J1 which is absent on the V1 (equipped with a more traditional anti-dust system). This design difference shouldn’t have any effect on image quality.
Other differences include:
But now let’s look a little closer at the V1’s DxOMark test results.
You can see the complete results here: Nikon 1 V1 measurements
No suspense here: the sensors for the Nikon V1 and the J1 are strictly the same (8.8 x 13.2 mm, 10.4Mpix). There are slight differences in the scores for each, resulting in an overall score of 54 for the V1 and 56 for the J1, but these differences are so small that they are well within the limits of measurement uncertainty and variances in manufacturing quality. (As a reminder, a difference in DxOMark scores of 5 points is equal to 1/3 stop and is barely noticeable on images.)
For more details, see the comparison between the two models here: Nikon 1 V1 vs Nikon 1 J1
It is possible, however, to raise some serious questions about the V1, as its price would tend to place it in competition with such cameras as the Nikon D5100 or even the Sony A580: Nikon V1 vs Sony A580 vs Nikon D5100
Similarly, pitted against a high-end compact such as the Fuji X100 or an entry-level DSLR such as the Sony A35, the V1 does not appear to justify its higher price: Nikon V1 vs Fuji X100 vs Sony SLT A35
In short, at this price, the V1’s sensor puts it at a disadvantage.
One last thing about the Nikon 1 line: we have detected some smoothing on RAW files —a first for Nikon, though a somewhat regular occurrence for Sony and Pentax cameras. As explained in more details in a previous article, such smoothing artificially suppresses noise by lightly mixing neighboring pixels, but comes at the price of a loss of resolution.
So as to fairly analyze each camera, we have estimated the amount of sensor noise prior to smoothing and indicated with a white dot each ISO for which we detected smoothing. More precisely, this smoothing is clearly apparent starting at ISO 800 and intensifies right up to the maximum ISO (ISO 6400).
The amount of smoothing also varies depending on the gray level: it is weak in highlights, but becomes proportionately stronger in the shadows.