SPECTRA is the 360 degree sensor suite for Rafale. SU-35 also has its own 360 degree sensor suite. I really dont have any clue how you tested and compared them.
Way too simplistic! Spectra is a EWS with many different sensors, for defensive and offensive use in detection, identification jamming and even targeting, with 360° or even spherical coverage.
The latest Flankers system is meant for defensive use only, to counter possible threats by jamming or long range detections and initiating countermeasures.
As i said already if you want to claim that it will have anything better then you should provide comparison of the technical specifications in question.
As for twin cockpit yes it offers advantage in some situations like ground strikes for example.
That goes both way, because you claim many things as well.
Take weapons for example, there is no operational Russian BVR missile with 200Km range, let alone with Ramjet propulsion like METEOR. The range is btw officially given with 100+ Km, but that is not important anyway, since the propulsion is the key feature! There is no missile with a higher smaller no escape zone like METEOR, because the high speed will be maintained in the full flight envelope. Latest R77 or AIM 120 for example offer possibly ranges that are close, but can be used only at half or 2/3 the range, because of the large no escape zone.
And when you compare the weapon package of Rafale with the Russian, you will find more weapons that are superior. MICA IR over R73/74, AASM over KAB PGMs, Scalp over Kh 59.
The Radar of the Su 35 offers more detecion range, because it's far bigger, but not because it technically better. The AESA of rafale detects more targets simultaneously, with multiple beams in a higher and needs less maintenance.
The biggest advantage though, are the passive detection and targeting features of Rafale. While the Su 35 is largly dependent on radar detection for offensive actions (IRST only for short ranges with WVR missiles), Rafale can stay fully passive, which makes it harder to detect, while beeing able to detect, track and engage them without using the radar at all (SPECTRA and MICA) and that even to BVR ranges.