I don't think any non-AESA radar can come close to BARS & IRBIS-E.
This is the latest
Thales RDY-3 MMR.
According to
this link as well as some French members at another def forum, it's the RDY-3 (improved RDY-2) that the IAF Mirages now have.
If you see the Thales link, it says RDY-3's average transmitting power is 400 W.
IAF MKI's BARS has an average output of 2,000-2,500 W (2.0-2.5kW), and a peak output exceeding 6,000 watts (6kW). So you can see where BARS is and where RDY-3 stands, in comparison.
Also given the fact BARS is a PESA which emits it's energy in different frequencies and changes the frequency many times per second, it's way more difficult to jam than RDY-3/APG-68 type radars.
Until the arrival of Rafale AESA and the Super-MKI AESA, the BARS will remain on the peak of fighter-based radars in this region. Up-gradation of Mirages' radars won't cast much of a shadow over the principle air-combat happening around here.
Mirage needs to have better radar for engaging enemies in self-defence if it gets caught while bombing their houses.