This place truly is a worthy "rival" to the famous Monta Ramen.
The only thing that makes this place slightly worse is their bowl is more expensive by a dollar or so. However, this place definitely has the flavor to match that of Monta. I ordered their spicy tonkotsu ramen with their flavored egg (which is a soft boiled egg) and I was very satisfied with what I got. Their broth is very rich and flavorful I didn't even need to season it at all. The only thing I found a bit weird was that the tonkotsu ramen was served with thick noodles rather than the traditional thin noodles (which they serve anyways.) I'll probably order the same thing with thin noodles next time.
Service was also great here, I'd say better than Monta. I came here with my large family which included a small child. My niece had the kid's meal which was a fried rice with fried chicken and also had a pudding dessert with a strawberry puree. The waitress noticed that my niece really enjoyed the strawberry and offered to give her some more. Our table was checked on frequently enough to feel hospitable but not too much that it was bothersome.
In my opinion, Jinya is a nicer restaurant where I would go on a date, where Monta is more touristy and casual. So depending on what you're in the mood for pick accordingly.