Velocity in lower registers

Midi keyboards that go for the most realistic piano simulation usually make keys in the low registers press with more resistance. I have a couple of questions regarding the velocity response in such cases.

First, are the sensors calibrated the same for all keys? Meaning, if I press the C1 note and the C7 note with the same exact strength, the C1 key will move down slower. Will the C1 sensor register lower velocity compared to the C7 sensor in this case, or are they calibrated to trigger the same velocity for the same amount of pressure applied?
Second, what is the industry standard for sampled piano VSTs? When the samples are being recorded, are the velocities 1 and 127 being played with the same strength for the notes C1 and C7, or are they somehow adjusted for the toughness of the lower keys of the real piano?

Depending on the combination of answers to these two questions, I'm trying to figure out which of the midi keyboards, when used with modern sampled piano VSTs, produce the correct gradation of velocity response going from lower to higher registers. The ones that have more resistance in the lower registers, or the ones that don't. It would be natural to assume the former, as they are going for the most realism, but somehow I'm not 100% sure about that.

Appreciate any help, as I couldn't find information on this anywhere.