I don't fully agree that, because the DS2000 series comes with "reduced noise" (~500µVpp in the smallest vertical diversion), what is contrary to what you've mentioned about MXT2001 and it's higher noise compared to the ADC08DL502. By the way, we may can expect that the MXT2001 is not just pin compatible, but exactly the same core out of the same asian factory?
You could well be right. I hadn't looked through the specs of the MXT2001 myself - only heard about it from others. A quick check of a couple of stats vs. the ADC08DL502:
SINAD Signal-to-Noise Plus Distortion Ratio (Typ):
ADC08DL502: AIN = 248 MHz @ -0.5dBFS 47.6 dB
MXT2001: AIN = 248 MHz @ -0.5dBFS 46 db
SNR Signal-to-Noise Ratio (Typ):
ADC08DL502: AIN = 248 MHz @ -0.5dBFS 48.5 dB
MXT2001: AIN = 248 MHz @ -0.5dBFS 47 dB
it is for sure MXT2001, ADC08D502 looks complettly different (i have them here and they looks exact the same as ADC08D500 on the picture), where MXT2002 in Owon looks like the unknown ADC used in Rigol. Just check the markers on picture.
Antoher confirmation is the fact that Owon is using now NS/TI ADCs insted of RuiFeng, Rigol is bigger so probobaly RuiFeng was happy to kick out Owon.
I don't fully agree that, because the DS2000 series comes with "reduced noise"
which as we know today didn't mean anything, others (e.g. Tekway, Hameg) have similar noise level on 2mV and 5mV,
Rigol simply added these extra ranges. Sure, they would be not possible with the AD8370/LHM6552 as used in DS1000E,
and it would get distorted too much by 10 interleaved ADCs, this is now complettly different with LMH6518 and one (die) ADC.
So a littlebit looks like Rigol learned from Hameg that is it enough to advertise "low / reduced noise"^^