The E40 is praised as the direct upgrade over the IM70, I suppose that the sound won't be ''thin'' and sibilant, I'm still waiting for my pair of E40 arriving from Soundprofessionals, I shall give a better impressions when comparing both.
The EX1 was sibilant on first usage, but within 10-15 hours of burn in + the proper tips for your ears, it won't be sibilant on warm daps but can still have some harshness on neutral to bright sources. I believe that 100 hrs + of burn in is necessary to get it right.
If you have 200 bucks to spend, you have better options ! I would suggest the RHA T20 as the best in this range (for sound and built quality), some runner ups :
a. Mee Electronics Pinnacle
b. Audio Technica IM02
c. Hifiman RE600
d. Aurisonics Rockets
e. Sleek Audio SA7
f. Venture Electronics Zen 2.0 (if you like earbuds)
g. Audio Technica CKR9LTD
Now it's up to you