It's tough between 009 and Susvara. The detail of the 009 when driven with good dac/amp is pretty impressive. The other 2 are not lacking in detail. They can all sound very natural. The Susvara is probably the most euphoric sounding of all 3. The Phi really doesn't standout. It does everything well and punches the hardest out of all 3, but the sound stage is small and has less detail than Susvara and 009. It's the least comfortable and heaviest of all 3. I think if I owned Susvara, there is not enough for me to get 009. If I have 009, I don't think I would go get Susvara. The Suvara is the most comfy out of all 3, so I have to pick one it would probably be the Susvara. I'm slightly biased since I own it for a year now.
I compared the Abyss, 009(with carbon amp) and Susvara many times over as my friend kept upgrading amps to achieve better results with both planars to try to bring up to 009 level resolve.
To me the Abyss stage has a larger (taller and closer) image in mid to lower spectrum, which is a bit skewd as it has a dip in trebles for depth, but...
The Susvara has the complete image further out in the distance, as well as being more uniform overall.
The 009 was always reference excellent, but it's image was too wide as it doesn't have angled pads for a more natural image.
This made it the closest overall, although it was still large, deep, and layered.
The bass was largest of course on the Abyss, but also the slowest by a slight margin. Susvara speed can match 009 in upper spectrum but mids to bass was more natural and planar like.
The depth of these three in the bass impact department are more realistic than the bass of utopia which is percieved fast but not "felt" as much in sub-bass dept.
The only headphone to clearly surpass all by any noticable margin a the raal ribbon headphone, but its its bass is not like any of the others mentioned and may not be satisfactory to those who like sub-bass impact.
All above my personal opinions, your results will vary.
I own susvara and abyss phi then upgraded to abyss Tc afterwards.
Even abyss phi, the soundstage of abyss is larger than susvara, imaging as well
I percieve the Abyss image larger yet about 10ft closer than Susvara in soundstage depth.